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Department of Animal Science: Faculty Publications

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Full-Text Articles in Animal Sciences

Multiple Trait Evaluation Of Bulls For Calving Ease, L. Dale Van Vleck, K. M. Edlin Feb 1984

Multiple Trait Evaluation Of Bulls For Calving Ease, L. Dale Van Vleck, K. M. Edlin

Department of Animal Science: Faculty Publications

Evaluation of bulls for calving difficulty of their calves by a multiple trait, mixed model procedure seems appropriate for a number of reasons. Average calving ease scores and their variances and heritabilities differ according to sex of calf and parity of mother. The multiple trait procedure automatically accounts for differences in averages, variances, and heritabilities. The procedure also allows for the magnitude of herd-year-season effects to be different for four traits as defined by calving difficulty scores when measured on: male birth by a heifer, female birth by a heifer, male birth by a cow, and female birth by a …

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Preweaning Survival In Swine: Heritability Of Direct And Maternal Effects, William R. Lamberson, R. K. Johnson Feb 1984

Preweaning Survival In Swine: Heritability Of Direct And Maternal Effects, William R. Lamberson, R. K. Johnson

Department of Animal Science: Faculty Publications

The heritabilities of direct and maternal effects on litter survival to weaning (LS) were estimated from records of 1,243 litters of pigs from the Nebraska Gene Pool population born from 1968 to 1981. Heritabilities were estimated by: (1) weighted least-squares regressions of average survival for litters of sons on average survival for litters of their sire, (2) nested analysis of variance with LS fitted to a model including year-line and sire of litter, (3) weighted least-squares regression of average survival for the litter of daughters on the survival of the litter of their dam and (4) nested analysis of variance …

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Effect Of Various Dietary Arginine: Lysine Ratios On Performance, Carcass Composition, And Plasma Amino Acid Concentrations Of Growing-Finishing Swine, L. C. Anderson, A. J. Lewis, E. R. Peo, Jr., J. D. Crenshaw Jan 1984

Effect Of Various Dietary Arginine: Lysine Ratios On Performance, Carcass Composition, And Plasma Amino Acid Concentrations Of Growing-Finishing Swine, L. C. Anderson, A. J. Lewis, E. R. Peo, Jr., J. D. Crenshaw

Department of Animal Science: Faculty Publications

Crossbred growing-finishing pigs (112 barrows, 48 gilts) were used to determine the effect of reducing excess dietary arginine, through feedstuff variation, on performance, carcass composition and plasma amino acid concentrations. Diets contained five, four, three or two times the NRC requirement for arginine. Lysine in all diets was formulated to be equal to NRC requirements, and all diets contained at least 100% of the NRC recommendations for all other essential amino acids.

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Genetic Trend For Milk Yield From Doe Evaluations In The Northeast United States, K. G. Boldman, L. Dale Van Vleck Jan 1984

Genetic Trend For Milk Yield From Doe Evaluations In The Northeast United States, K. G. Boldman, L. Dale Van Vleck

Department of Animal Science: Faculty Publications

Milk production records of 306 Alpine, 72 LaMancha, 170 Nubian, 84 Saanen, and 235 Toggenburg does born in the Northeast from 1972 through 1979 were used to estimate trends of additive genetic value. Estimated transmitting abilities were doubled and averaged for all does born in each year to obtain yearly estimates of genetic value. Genetic trends from regression of yearly mean genetic value on year of birth for Alpine, La- Mancha, Nubian, Saanen, and Toggenburg averaged 11.4, -7.9, 1.9, 14.6, and 11.7 kg per year. Genetic trends were less than theoretically possible, indicating that more effective selection schemes are needed, …

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Inbreeding Of Artificially Bred Dairy Cattle In The Northeastern United States, G. F. S. Hudson, L. Dale Van Vleck Jan 1984

Inbreeding Of Artificially Bred Dairy Cattle In The Northeastern United States, G. F. S. Hudson, L. Dale Van Vleck

Department of Animal Science: Faculty Publications

Inbreeding coefficients of artificially bred Ayrshire, Guernsey, Holstein, Jersey, and Brown Swiss cows were calculated from relationships between sires and maternal male ancestors. Percentages of inbred cows and average inbreeding coefficients of inbred cows were: Ayrshire, 26 and 11%; Guernsey, 11 and 4%; Holstein, 31 and 1%; Jersey 23 and 2%; and Brown Swiss, 23 and 2%. Percentages of inbred cows and average inbreeding coefficients of all cows increased over time whereas average coefficients of inbred cows decreased over time. These temporal trends may be due in part to having more pedigree information available for cows born in later years. …

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Effects Of Excess Arginine With And Without Supplemental Lysine On Performance, Plasma Amino Acid Concentrations And Nitrogen Balance Of Young Swine, L. C. Anderson, A. J. Lewis, E. R. Peo, Jr., J. D. Crenshaw, Win Butler Jan 1984

Effects Of Excess Arginine With And Without Supplemental Lysine On Performance, Plasma Amino Acid Concentrations And Nitrogen Balance Of Young Swine, L. C. Anderson, A. J. Lewis, E. R. Peo, Jr., J. D. Crenshaw, Win Butler

Department of Animal Science: Faculty Publications

Three experiments were conducted to determine the effects of excess arginine on performance, plasma amino acid levels and N balance of young pigs (initial weights 6.9, 7.0 and 10.3 kg, respectively). In a 28-d growth trial, various amounts of arginine (0 to 1.6%) were added to a conventional starter diet.

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Relationship Of Lactation Energy Intake And Occurence Of Postweaning Estrus To Body And Back Fat Composition In Sows, D. E. Reese, E. R. Peo, Jr., A. J. Lewis Jan 1984

Relationship Of Lactation Energy Intake And Occurence Of Postweaning Estrus To Body And Back Fat Composition In Sows, D. E. Reese, E. R. Peo, Jr., A. J. Lewis

Department of Animal Science: Faculty Publications

Forty-five crossbred primiparous sows were used to determine the relationship of lactation energy intake and the occurrence of post-weaning estrus to (1) body fat (percentage), (2) lean body mass (LBM) and (3) qualitative and quantitative characteristics of adipose tissue. Sows received 8 (Lo) or 16 (Hi) Meal of metabolizable energy (ME)/d during lactation and 5.4 Meal of ME/d post-weaning.

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Effect Of Suckling And Ovariectomy On The Control Of Luteinizing Hormone Secretion During The Postpartum Period In Beef Cows, M. Garcia-Winder, K. Imakawa, M. L. Day, D. D. Zalesky, Roger J. Kittok, J. E. Kinder Jan 1984

Effect Of Suckling And Ovariectomy On The Control Of Luteinizing Hormone Secretion During The Postpartum Period In Beef Cows, M. Garcia-Winder, K. Imakawa, M. L. Day, D. D. Zalesky, Roger J. Kittok, J. E. Kinder

Department of Animal Science: Faculty Publications

Twenty-two mature pluriparous beef cows were randomly assigned to one of six treatments in a 2 x 3 factorial experiment in order to study the role of suckling and ovarian factors on control of the tonic and episodic release of luteinizing hormone (LH). Twelve cows remained intact (INT) and 10 were ovariectomized (OVX) within 4 days following the day of parturition (Day 0). The suckling intensities were nonsuckled (0), suckled once daily for 30 mm (1) and suckled ad libitum by two calves (2). Blood samples were collected at 1 5-mm intervals for 6 h weekly, from Days 6 to …

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The Nutritional Value Of High Moisture And Reconstituted Sorghum Grain For Swine, J. D. Crenshaw, E. R. Peo, Jr., A. J. Lewis, B. D. Moser, T. D. Crenshaw Jan 1984

The Nutritional Value Of High Moisture And Reconstituted Sorghum Grain For Swine, J. D. Crenshaw, E. R. Peo, Jr., A. J. Lewis, B. D. Moser, T. D. Crenshaw

Department of Animal Science: Faculty Publications

A growing-finishing experiment involving 150 crossbred swine (replicated by time) and two metabolism experiments involving 36 crossbred barrows were conducted to determine the nutritional value of harvested high moisture (HMSG), reconstituted (RCSG) and dry sorghum grain (DSG) for swine. In Exp. 1, pigs fed HMSG diets gained the same, consumed similar amounts of feed, but less (P<.05) crude protein (equivalent dry matter basis) and had better (P<.05) feed conversion than pigs fed DSG diets.

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Effects Of Inbreeding On Milk And Fat Production, Stayability, And Calving Interval Of Registered Ayrshire Cattle In The Northeastern United States, G. F. S. Hudson, L. Dale Van Vleck Jan 1984

Effects Of Inbreeding On Milk And Fat Production, Stayability, And Calving Interval Of Registered Ayrshire Cattle In The Northeastern United States, G. F. S. Hudson, L. Dale Van Vleck

Department of Animal Science: Faculty Publications

Inbreeding coefficients of 30,794 registered Ayrshire cows were calculated from relationships between sire and maternal male ancestors. Average inbreeding coefficient of all cows was less than 1% and of the 5,202 inbred cows was 5.4%. Fewer than 2% of inbred cows had coefficients greater than 15%. Percent of inbred cows increased from 23% of cows born in 1972 to 43% in 1980. Over the same period average inbreeding coefficient of all cows increased from 1.2 to 2.0%, but average coefficient of inbred cows decreased from 5.6 to 4.7%.

Effects of inbreeding on first lactation, 305-day, 2x, mature equivalent milk and …

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Reciprocal Recurrent Selection For 21-Day Litter Weight Of Crossbred Gilts. I. Selection Applied And Genetic Change In Reproduction Of Crossbred Gilts, L. D. Young, I. T. Omtvedt, J. A. Whatley Jr., R. K. Johnson Jun 1983

Reciprocal Recurrent Selection For 21-Day Litter Weight Of Crossbred Gilts. I. Selection Applied And Genetic Change In Reproduction Of Crossbred Gilts, L. D. Young, I. T. Omtvedt, J. A. Whatley Jr., R. K. Johnson

Department of Animal Science: Faculty Publications

Six cycles of reciprocal recurrent selection (RRS) between Line 8 (Duroc) and Line 9 (Beltsville No. 1) were completed at the Fort Reno Livestock Research Center, E1 Reno, Oklahoma. A randomly mated control line was maintained. Each cycle of selection required three seasons. Selection of purebred pigs (born in the second season) was based on the mean 21-d litter weight of their maternal and paternal half-sib crossbred gilts that were born in the first season and farrowed in the third season (XB21DLWT). On the average, 5.8 maternal and paternal half-sib gilts contributed to the mean XB21DLWT for each purebred individual. …

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Reciprocal Recurrent Selection For 21-Day Litter Weight Of Crossbred Gilts. Ii. Reproductive Performance Of Purebred Females Producing Purebred And Two-Way Cross Litters And Performance Of Purebred And Crossbred Pigs, L. D. Young, I. T. Omtvedt, J. A. Whatley Jr., R. K. Johnson Jun 1983

Reciprocal Recurrent Selection For 21-Day Litter Weight Of Crossbred Gilts. Ii. Reproductive Performance Of Purebred Females Producing Purebred And Two-Way Cross Litters And Performance Of Purebred And Crossbred Pigs, L. D. Young, I. T. Omtvedt, J. A. Whatley Jr., R. K. Johnson

Department of Animal Science: Faculty Publications

This paper reports estimates of correlated genetic change in reproductive performance of purebred gilts producing two-way cross litters and purebred sows producing purebred litters as well as postweaning performance of two-way cross and purebred pigs produced during reciprocal recurrent selection (RRS) between Line 8 (Duroc) and Line 9 (Beltsville No. 1) for 21-d litter weight production of crossbred gilts. A randomly mated control line developed from a crossbred foundation was maintained to monitor environmental change. Data were adjusted for age of dam, inbreeding of dam, inbreeding of litter (or pig) and linear and quadratic effects of day born within season. …

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Genetic And Phenotypic Parameters Estimated From Nebraska Speci Fic-Pathogen-Free Swine Field Records, P. J. David, R. K. Johnson, T. E. Socha May 1983

Genetic And Phenotypic Parameters Estimated From Nebraska Speci Fic-Pathogen-Free Swine Field Records, P. J. David, R. K. Johnson, T. E. Socha

Department of Animal Science: Faculty Publications

Records collected during 1971 through 1979 from 101,606 hogs raised in 18 Nebraska Specific Pathogen Free herds were analyzed. Traits considered were backfat at 100 kg (BF), weight at 140 d of age (WT) and, in some analyses, number of live pigs/litter at birth (NBA). The phenotypic correlation of BF and WT, averaged across herds, was -.07. The correlations between BF and NBA and between WT and NBA were .04 and -.05, respectively. Average phenotypic standard deviations for BF, WT and NBA were 2.6 mm, 8.8 kg and 2.0 pigs. Estimates of the heritability of BF and WT were lower …

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Testicular Growth In Boars Of Different Genetic Lines And Its Relationship To Reproductive Performance , Allan Schinckel, R. K. Johnson, R. A. Pumfrey, Dwane R. Zimmerman May 1983

Testicular Growth In Boars Of Different Genetic Lines And Its Relationship To Reproductive Performance , Allan Schinckel, R. K. Johnson, R. A. Pumfrey, Dwane R. Zimmerman

Department of Animal Science: Faculty Publications

Testicular growth of 377 boars was compared by obtaining in situ measurements of testes width and length and excised tissue weights. Two experiments involved a line selected nine generations for ovulation rate (OR) and a control line (CL), and two experiments contained boars of the OR line and two other lines; WL, a Large White-Landrace cross, and a line founded by crossing lines OR and CL and selected six generations for increased average daily gain and decreased backfat (LG line). In situ testes measurements were similar for the OR and CL lines and were curvilinearly related to age. The LG …

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Simulation Of Breed And Crossbreeding Effects On Costs Of Pork Production, G. L. Bennett, W. M. Tess, G. E. Dickerson, R. K. Johnson Apr 1983

Simulation Of Breed And Crossbreeding Effects On Costs Of Pork Production, G. L. Bennett, W. M. Tess, G. E. Dickerson, R. K. Johnson

Department of Animal Science: Faculty Publications

A bio-economic model of swine production was used to simulate expected performance effects of breeds in alternative breeding systems on total costs/100 kg of live weight (EWW) or/l00 kg lean (ELW) for marketing at 100 kg live weight and on costs/100 kg lean for marketing at mean 185-d weight (ELA). Effects of heterosis and of six U.S. breeds were simulated for integrated industry purebred (P), two-breed specific (2S), backcross (2B) and rotation cross (2R), and three-breed specific (3S) and rotation cross (3R) breeding systems. Traits considered were age at puberty (-PUB), conception rate (CR), litter size born alive (NBA), preweaning …

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Simulation Of Heterosis Effects On Costs Of Pork Production, G. L. Bennett, M. W. Tess, G. E. Dickerson, R. K. Johnson Apr 1983

Simulation Of Heterosis Effects On Costs Of Pork Production, G. L. Bennett, M. W. Tess, G. E. Dickerson, R. K. Johnson

Department of Animal Science: Faculty Publications

Individual plus maternal heterotic effects on swine production were simulated with a bioeconomic model by changing performance levels of eight traits: -8 d in age at puberty, +3% in conception rate, +.94 in pigs born/litter, +.035 kg in pig birth weight, +2.05 Mcal•sow-1•d -1 in maximum milk output, +8% in preweaning survival, +10.8% in protein growth rate and +17.3% in fat growth rate. Associated heterosis simulated for other traits, such as weaning weights and postweaning gain/feed, was similar to experimental results. Effects of heterosis on biological (feed Mcal/kg) and economic ($/kg) costs were evaluated by simulating two- and …

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Index Selection And Feed Intake Restriction In Swine, I: Effect On Rate And Composition Of Growth, Erik R. Cleveland, R. K. Johnson, R. W. Mandigo Mar 1983

Index Selection And Feed Intake Restriction In Swine, I: Effect On Rate And Composition Of Growth, Erik R. Cleveland, R. K. Johnson, R. W. Mandigo

Department of Animal Science: Faculty Publications

The objectives of this experiment were to determine the effects of index selection for increased average daily gain and decreased backfat, and the effects of restriction of daily feed intake, on rate and composition of growth in swine. A total of 53 barrows from select and control lines were randomly assigned to three feeding levels at 83 d of age, and 33 littermate barrows were slaughtered to establish initial body composition. The trial was approximately 105 d and the feeding levels were twice daily to appetite (AP), once daily feeding of 91% of appetite (AP9l) and once daily feeding of …

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Index Selection And Feed Intake Restriction In Swine, Ii: Effect On Energy Utilization, Erik R. Cleveland, R. K. Johnson, R. W. Mandigo, E. R. Peo Jr. Mar 1983

Index Selection And Feed Intake Restriction In Swine, Ii: Effect On Energy Utilization, Erik R. Cleveland, R. K. Johnson, R. W. Mandigo, E. R. Peo Jr.

Department of Animal Science: Faculty Publications

Fifty-three index select and control line barrows were randomly assigned to three feeding levels at 83 d of age. They were slaughtered at approximately 188 d of age to determine the effects of index selection (for increased average daily gain and decreased backfat) and level of feed intake on energy utilization. During the trial, the feed intake levels were twice daily to appetite (AP), once daily feeding of 91% of appetite (AP91) or once daily feeding of 82% of appetite (AP82) intake. The metabolizable energy intake required per kilogram of edible lean deposited (Mcal/kg) was reduced (P.75)-1 x day …

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The Effects Of Level Of Crude Protein On Performance Of Growing Boars, R. W. Tyler, W. G. Luce, R. K. Johnson, C. V. Maxwell, R. L. Hintz, L. E. Walters Feb 1983

The Effects Of Level Of Crude Protein On Performance Of Growing Boars, R. W. Tyler, W. G. Luce, R. K. Johnson, C. V. Maxwell, R. L. Hintz, L. E. Walters

Department of Animal Science: Faculty Publications

Five trials involving 432 growing boars were utilized to study the effects of six levels of crude protein on gain, feed efficiency, feed intake, backfat thickness and longissimus muscle area. The boars were fed ad libitum either a 14, 16, 18, 20, 22 or 24% crude protein diet from about 24.6 to 54.4 kg (period 1). From 54.4 to 98.8 kg (period 2), the crude protein in each diet was reduced by 2%. During period 1, gain increased and feed to gain ratio decreased quadratically (P<.05)with increasing dietary crude protein in corn-soybean meal based diets and were maximum at protein levels of 20 to 22%. Feed intake was not affected by dietary protein level. During period 2, protein level did not significantly affect rate of gain, feed efficiency or feed intake. Overall, gain increased quadratically (P<.05)with increasing protein levels and was maximum for boars fed the 20/18% protein sequence during periods 1 .and 2, respectively. Feed to gain ratio decreased linearly (P<.05) with increasing dietary protein intake. Feed intake was not affected by dietary protein level. Scan backfat thickness and longissimus muscle area obtained at the end of the trial indicated that backfat decreased linearly (P<.05) with increasing protein intake, while longissimus muscle area increased quadratically (P<.05) as protein in the diet increased. These results indicate that small improvements in average daily gain, feed efficiency, longissimus muscle area and backfat thickness can be made by feeding protein levels to growing boars approximately 2% higher than the currently recommended 18% protein diet during the growing period (24.6 to 58.4 kg), followed by an 18% diet during the finishing period (54.8 to 98.8 kg).

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Breed And Heterosis Effects On Testicular Development And Endocrine Function Of Puberal Boars, R. W. Fent, R. P. Wettemann, R. K. Johnson Feb 1983

Breed And Heterosis Effects On Testicular Development And Endocrine Function Of Puberal Boars, R. W. Fent, R. P. Wettemann, R. K. Johnson

Department of Animal Science: Faculty Publications

Purebred and two-breed cross Duroc, Landrace, Spotted and Yorkshire boars were evaluated at 218 ± 6 d of age to determine the influence of breed on testicular development and on concentrations of luteinizing hormone (LH) and testosterone in blood serum after treatment with gonadotropin releasing hormone (GnRH). Concentrations of LH and testosterone were determined in serum samples obtained from the vena cava of 139 boars just before and 1, 2, 3 and 4 h after an im injection of 200/ μg of GnRH. The right testes of 136 boars were removed and sperm numbers were determined in homogenates of testicular …

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Variances Of Prediction Errors For Differences Of Estimated Genetic Values Of Cows In The Same And In Different Herds, D. C. Bolgiano, R. L. Quaas, L. Dale Van Vleck Jan 1983

Variances Of Prediction Errors For Differences Of Estimated Genetic Values Of Cows In The Same And In Different Herds, D. C. Bolgiano, R. L. Quaas, L. Dale Van Vleck

Department of Animal Science: Faculty Publications

A modification of the evaluation method for cows in the northeast United States allowed simultaneous evaluation of cows in pairs of herds and computation of variances of prediction errors of differences of genetic potential between pairs of cows within and across herds. These variances were examined for 20 pairs of herds in Holstein, Jersey, and Brown Swiss breeds. Current evaluations of cows are nearly as accurate for comparing cows from different herds as they are for comparing cows from the same herd.

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"Dried Fat" For Growing-Finishing Swine, K. E. Keaschall, B. D. Moser, E. R. Peo, Jr., A. J. Lewis, T. D. Crenshaw, Win Butler Jan 1983

"Dried Fat" For Growing-Finishing Swine, K. E. Keaschall, B. D. Moser, E. R. Peo, Jr., A. J. Lewis, T. D. Crenshaw, Win Butler

Department of Animal Science: Faculty Publications

Three trials were conducted to determine the effect of "dried fat" (fats absorbed on carriers) in diets for growing-finishing swine. In trial I pigs receiving diets containing 5% added fat gained faster (.74 vs .71 kg/d), consumed less feed (1.87 vs 2.43 kg/d) and had a better feed efficiency (2.52 vs 2.88) than pigs fed diets without added fat (all P<.01). Pigs given the "dried fat" treatments gained faster (P<.01) and more efficiency (P<.01) than pigs fed the nonfat carrier counterpart. "Dried fats" containing whey plus fat and wheat bran plus fat produced similar performance to that observed with pigs fed a conventional tallow diet.

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Genetic Groups In Dairy Sire Evaluation Under A Selection Model, T. R. Famula, E. J. Pollak, L. Dale Van Vleck Jan 1983

Genetic Groups In Dairy Sire Evaluation Under A Selection Model, T. R. Famula, E. J. Pollak, L. Dale Van Vleck

Department of Animal Science: Faculty Publications

The frequently arbitrary application and definition of genetic groups makes sire grouping the “weak link” of the sire evaluation process. A selection model for records not in the model for observations is similar in form to the genetic groups model. Implications of this correspondence are discussed and illustrated through a small example. Guidelines for possible grouping strategies also are discussed.

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Comparison Of Dams' Estimated Transmitting Abilities From First Lactation Herdmates Or All Records Of Herdmates To Predict Sons' Milk Evaluations, L. Dale Van Vleck, P. A. Murphy Jan 1983

Comparison Of Dams' Estimated Transmitting Abilities From First Lactation Herdmates Or All Records Of Herdmates To Predict Sons' Milk Evaluations, L. Dale Van Vleck, P. A. Murphy

Department of Animal Science: Faculty Publications

Multiple regression of genetic evaluations for milk yields of first lactations of 159 Holstein bulls on sire, dam, and maternal grandsire evaluations indicates that the weight for estimated transmitting ability of the dam calculated from the first record of the dam and first records of her herdmates is about as theoretically expected and is markedly superior both to estimated transmitting ability computed from the first record of the dam and all records of her herdmates and to estimated transmitting ability computed from all records of the dam and her herdmates. The latter two procedures gave similar results.

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Memorials: Vincent H. Arthauld, Kenneth J. Drewry, David L. Mackintosh Sep 1982

Memorials: Vincent H. Arthauld, Kenneth J. Drewry, David L. Mackintosh

Department of Animal Science: Faculty Publications

Vincent H. Arthaud, Professor Emeritus of the Animal Science Department, University of Nebraska, Lincoln, died at his home August 7, 1982. He was born September 7, 1911 at Cambridge, Nebraska and was reared on a general livestock farm in Southwest Nebraska. After receiving his B.S. degree in Animal Husbandry in 1936 from the University of Nebraska, he returned to his home area and engaged in general farming. He served with the U.S. Army from 1942 to 1945 and joined the Animal Science Department in 1945 as Research Farm Manager. He retired in 1977 following his many years of service as …

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Computer Algorithm For The Recursive Method Of Calculating Large Numerator Relationship Matrices, G. F. S. Hudson, R. L. Quaas, L. Dale Van Vleck Feb 1982

Computer Algorithm For The Recursive Method Of Calculating Large Numerator Relationship Matrices, G. F. S. Hudson, R. L. Quaas, L. Dale Van Vleck

Department of Animal Science: Faculty Publications

A method of storing and retrieving nonzero elements of a large, sparse symmetric matrix using only internal computer storage is presented. An algorithm for applying the recursive or tabular method of calculating the numerator relationship matrix of a large group of animals is given. The algorithm is applicable to inbred and noninbred populations and can be used on sire/dam or sire/maternal grandsire pedigrees.

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Effect Of Grain Source And Dietary Level Of Oat Hulls On Phosphorus And Calcium Utilization In The Growing Pig, R. L. Moser, E. R. Peo, Jr., B. D. Moser, A. J. Lewis Jan 1982

Effect Of Grain Source And Dietary Level Of Oat Hulls On Phosphorus And Calcium Utilization In The Growing Pig, R. L. Moser, E. R. Peo, Jr., B. D. Moser, A. J. Lewis

Department of Animal Science: Faculty Publications

Three metabolism trials were conducted to determine the effect of grain source and dietary level of oat hulls on dry matter digestibility, P and Ca retention and intestinal phytase activity of growing pigs. Twenty-four crossbred pigs (39 kg)were used. Dry matter digestibilities of corn-based diets were greater (P<.01) than grain sorghum-based diets (74.7 vs 63.5%). Diets containing 10% oat hulls had lower (P<.01) dry matter digestibilities than diets containing no oat hulls (64.0 vs 74.2%).

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Estimation Of Components Of Variance By Method 3 And Henderson's New Method, G. F. S. Hudson, L. Dale Van Vleck Jan 1982

Estimation Of Components Of Variance By Method 3 And Henderson's New Method, G. F. S. Hudson, L. Dale Van Vleck

Department of Animal Science: Faculty Publications

An algorithm for Method 3 for estimation of components of variance in a mixed model including fixed herd-year-season, genetic groups, and random sires nested within groups is presented. Computational aspects of the algorithm are discussed and compared with those of a new method of Henderson's. The new method involves equating quadratic forms based on approximate best linear unbiased prediction solutions to their expected values. Relative computing effort for the two methods depended on the ease of eliminating equations for fixed effects and on the number of traits. Numerical estimates from the two methods were similar. When the Method 3 estimate …

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Breed Comparisons For Age And Weight At Puberty In Gilts, L. K. Hutchens, R. L. Hintz, R. K. Johnson Jan 1982

Breed Comparisons For Age And Weight At Puberty In Gilts, L. K. Hutchens, R. L. Hintz, R. K. Johnson

Department of Animal Science: Faculty Publications

Data on 213 purebred and 524 crossbred gilts produced in a four-breed diallel crossing design involving the Duroc (D), Yorkshire (Y), Landrace (L) and Spotted (S)breeds were analyzed for age and weight at puberty. The breed of sire x breed of dam interaction was significant for both age and weight at puberty. However, differences among reciprocals were not significant, and thus, reciprocal means were combined. Crossbreds were younger (7.9 d) and heavier (1.2 kg) at puberty than purebreds. Significant heterosis for age at puberty was found for D X L (-14.3 d),S x D (-12.8 d) and S x L …

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Derivation Of Henderson's Method Of Incorporating Artificial Insemination Sire Evaluations Into Intraherd Prediction Of Breeding Values, L. Dale Van Vleck Jan 1982

Derivation Of Henderson's Method Of Incorporating Artificial Insemination Sire Evaluations Into Intraherd Prediction Of Breeding Values, L. Dale Van Vleck

Department of Animal Science: Faculty Publications

A derivation is given for the method proposed by Henderson to incorporate evaluations of sires based on daughter records in other herds into the intraherd prediction of breeding values. The derivation consists of pretending the daughters in other herds have records which have been adjusted for the herd-year-season effects of their origin. These equations then are absorbed into the equation for the sire which is tied to both sets of daughters by elements of the inverse of the matrix of relationships.

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