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Journal

Kansas Agricultural Experiment Station Research Reports

Animal Sciences

1988

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Articles 31 - 60 of 90

Full-Text Articles in Life Sciences

Incidence Of Pregnancy In Feedlot Heifers At Slaughter, S.B. Laudert Jan 1988

Incidence Of Pregnancy In Feedlot Heifers At Slaughter, S.B. Laudert

Kansas Agricultural Experiment Station Research Reports

Nearly 83,000 heifers were observed at slaughter during 1986 and 1987 to determine their reproductive status. Slightly less than 4 percent were found to be pregnant. Highest incidences of pregnancy were found during the winter months of November through March. Lowest incidences were found during August, September. and October.

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Experimental Induction And Monitoring Of Liver Abscesses In Cattle With Ultrasonography, K.F. Lechtenberg, T.B. Avery, Tiruvoor G. Nagaraja Jan 1988

Experimental Induction And Monitoring Of Liver Abscesses In Cattle With Ultrasonography, K.F. Lechtenberg, T.B. Avery, Tiruvoor G. Nagaraja

Kansas Agricultural Experiment Station Research Reports

We have demonstrated that ultrasonography can be used to visualize liver abscess in live cattle. We have also developed a nonsurgical method of catheterizing the bovine portal vein and experimentally inducing liver abscesses by inoculating the portal vein with Fusobacterium necrophorum bacteria.

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Whole-Plant Forage And Grain Sorghums And Corn Silages For Growing Cattle, B. Kirch, S. Hamma, K. Bolsen, J. Hoover, Jack G. Riley Jan 1988

Whole-Plant Forage And Grain Sorghums And Corn Silages For Growing Cattle, B. Kirch, S. Hamma, K. Bolsen, J. Hoover, Jack G. Riley

Kansas Agricultural Experiment Station Research Reports

Two trials were conducted to determine the feeding value of whole-plant forage sorghum, grain sorghum, and corn silages, with and without 25% rolled grain sorghum added to the ration. In general, growing cattle fed corn or grain sorghum silages out-performed those fed forage sorghum silages. Only forage sorghums with moderate grain yields supported gains approaching those from grain sorghum silages. With the addition of 25% rolled grain sorghum, cattle performance from the low and medium grain-yielding forage sorghum silages was improved greatly (gains by 20 to 44%, dry matter intake by 12 to 17%, feed conversion by 4 to 25%). …

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Evaluation Of Mga And Prostaglandin As An Estrous Synchronization Procedure Under Field Conditions, P.L. Houghton, L.R. Corah, T.B. Goehring Jan 1988

Evaluation Of Mga And Prostaglandin As An Estrous Synchronization Procedure Under Field Conditions, P.L. Houghton, L.R. Corah, T.B. Goehring

Kansas Agricultural Experiment Station Research Reports

When fed MGA (0.5 mg.hd/day) for 14 days, followed by a prostaglandin injection 17 days later, a total of 736 out of 1112 heifers at 11 locations expressed signs of estrus within 5 days following the PG injection for a 66.2% response to synchronization. Response rates between locations ranged from 33 to 95% (P<.05). In a comparison of prostaglandin forms at 5 locations, using 789 heifers, response to synchronization was similar (P=.66) between Lutalyse® (62.7% response) and Bovilene® (59.6% response). First-service conception rate was compared in 411 heifers at two locations and was higher for Lutalyse (68.996) than Bovilene (59.996) (P<.08). First-service conception rate varied by technician (P<.05) and ranged from 48.7 to 83.6%.

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Farm, Wholesale, And Retail Beef Price Relationship, Ted C. Schroeder Jan 1988

Farm, Wholesale, And Retail Beef Price Relationship, Ted C. Schroeder

Kansas Agricultural Experiment Station Research Reports

Analysis of weekly retail, wholesale, and farm beef price data indicated that a time lag exists between price changes at the various market levels. Farm-level slaughter cattle price changes typically lead wholesale beef price changes by 2 to 3 weeks. Similarly, wholesale beef price changes typically lead price changes at the retail level by 3 to 4 weeks.

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Evaluation Of Interseeded Grain Sorghum And Soybeans As 8 Silage Crop, S.H.M. Esmail, K. Bolsen, S. Azimi, John E. Shirley Jan 1988

Evaluation Of Interseeded Grain Sorghum And Soybeans As 8 Silage Crop, S.H.M. Esmail, K. Bolsen, S. Azimi, John E. Shirley

Kansas Agricultural Experiment Station Research Reports

Interseeded grain sorghum and soybeans were harvested at late-boot, milk, and late-dough maturity stages of the sorghum (62, 77, and 91 days post-planting, respectively). Maximum dry matter yield occurred at the late-dough stage and interseeded silages had higher crude protein contents than the control, late-dough) grain sorghum silage. All silages underwent normal homolactic fermentations and were well preserved. Cellulose and acid detergent fiber contents were also higher in the mixtures than in the control silage, but fiber values decreased as maturity advanced. Digestibilities of most nutrients were similar in the rations, but when considered with chemical composition and yield data, …

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Influence Of Supplemental Protein Concentration On The Performance Of Beef Cows Grazing Dormant Bluestem Range, T. Delcurto, B. Cochran, L. Corah Jan 1988

Influence Of Supplemental Protein Concentration On The Performance Of Beef Cows Grazing Dormant Bluestem Range, T. Delcurto, B. Cochran, L. Corah

Kansas Agricultural Experiment Station Research Reports

Three milo/soybean meal mixtures representing three supplemental crude protein concentrations (13, 26, and 39%) were evaluated in terms of pregnant beef cow performance. Cow weight and body condition changes responded in a linear fashion to increasing protein. Cattle fed the high protein (39% Crude Protein) supplement lost the least weight and body condition, whereas cattle supplemented with the low protein treatment lost the most. Although there was little difference between treatment groups in terms of reproductive efficiency and subsequent calf performance, moderate (26% Crude Protein) and high protein supplements appear to offer the most benefit in maintaining cow\weight and body …

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Early Postpartum Luteal Function After Treatment With Progestin And(Or) Gonadotropin-Releasing Hormone In Dairy Cattle (1988), M.O. Mee, Jeffrey S. Stevenson Jan 1988

Early Postpartum Luteal Function After Treatment With Progestin And(Or) Gonadotropin-Releasing Hormone In Dairy Cattle (1988), M.O. Mee, Jeffrey S. Stevenson

Kansas Agricultural Experiment Station Research Reports

Progestin (Norgestomet®) and(or) repeated low-dose infusions of GnRH (Cystorelin@) influenced the lifespan of the first corpus luteum after an induced ovulation. Holstein cows (n=32) were assigned at calving to four groups. Cows were treated with blank ear implants (days 2 to 9 after calving) and saline infusion (48 hr on days 10 arid II), progestin ear implants and saline infusion, blank implants and GnRH infusion, or progestin implants and GnRH infusion prior to a GnRH-induced ovulation (day 12). Four primiparous and four multiparous cows were assigned to each treatment. Fewer cows treated with progestin/GnRH ovulated in response to the GnRH …

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1988 Agricultural Research, Southeast Kansas Branch Station, K. P. Coffey, J. L. Moyer, L. W. Lomas, D. W. Sweeney, G. V. Granade, T. Walter, K. W. Kelley Jan 1988

1988 Agricultural Research, Southeast Kansas Branch Station, K. P. Coffey, J. L. Moyer, L. W. Lomas, D. W. Sweeney, G. V. Granade, T. Walter, K. W. Kelley

Kansas Agricultural Experiment Station Research Reports

Research on beef cattle, crops, and related topics at Southeast Kansas Branch Station.

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Effect Of Processing On The Nutritional Value Of Soybean Proteins (1988), Joe D. Hancock Jan 1988

Effect Of Processing On The Nutritional Value Of Soybean Proteins (1988), Joe D. Hancock

Kansas Agricultural Experiment Station Research Reports

It has been recognized for many years that some sort of processing of soybeans will yield a product of superior nutritional value. As our understanding of the effects of different processing techniques increases, we will continue to see advances in technology that will yield soybean products of superior nutritional value. The challenge for livestock producers is to recognize the products that offer improved nutritional benefits and to have the wherewithal to use those products when they are economically advantageous.; Swine Day, Manhattan, KS, November 17, 1988

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Utilization By Finishing Pigs Of Reconstituted Sorghum Grain Treated With Enzymes Or Enzymes Plus A Bacterial Inoculant Prior To Ensiling (1988), J I. Heidker, Keith C. Behnke Jan 1988

Utilization By Finishing Pigs Of Reconstituted Sorghum Grain Treated With Enzymes Or Enzymes Plus A Bacterial Inoculant Prior To Ensiling (1988), J I. Heidker, Keith C. Behnke

Kansas Agricultural Experiment Station Research Reports

One hundred eight finishing pigs averaging 117 lb were used to evaluate the effects of adding enzymes with or without a bacterial inoculant to reconstituted sorghum grain used in swine diets. No differences were noted in gain, feed efficiency, or carcass characteristics as determined by ultrasonic scanning.; Swine Day, Manhattan, KS, November 17, 1988

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Effect Of A Probiotic On Prevention Of Salmonellosis In Pigs (1988), K B. Beeman, D E. Erickson, B J. Henning Jan 1988

Effect Of A Probiotic On Prevention Of Salmonellosis In Pigs (1988), K B. Beeman, D E. Erickson, B J. Henning

Kansas Agricultural Experiment Station Research Reports

An experiment was conducted to determine if a commercial probiotic compound could be used to bring about competitive exclusion of Salmonella organisms. The probiotic material was added to the feed of one group of pigs and was not added to the feed of a control group. Both groups of pigs were dosed orally with 10^6 CFU of Salmonella cholerasuis. All pigs were affected; however, the treated group demonstrated less illness than the control group.; Swine Day, Manhattan, KS, November 17, 1988

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Transient Hypersensitivity To Soybean Meal In The Early-Weaned Pig (1988), D F. Li, G Reddy, Frank Blecha, Joe D. Hancock, G Allee, Jim L. Nelssen Jan 1988

Transient Hypersensitivity To Soybean Meal In The Early-Weaned Pig (1988), D F. Li, G Reddy, Frank Blecha, Joe D. Hancock, G Allee, Jim L. Nelssen

Kansas Agricultural Experiment Station Research Reports

An experiment was conducted to determine if baby pigs develop intestinal hypersensitivity to dietary soy protein. Challenging nursery pigs with soybean meal following oral infusion of soybean meal from day 7 to day 14 of age resulted in villus atrophy and lower average daily gain by 28 days of age. At 56 days of age, there were no differences in weight gains between pigs fed soy protein and pigs fed milk protein. Pigs exposed to soybean meal before weaning had increased anti-soybean protein immnoglobulin titers at 4 wk (7.2 vs 4.0) and at 8 wk (7.6 vs 4.2). Thus, challenging …

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Effect Of Dietary Folic Acid Additions On Sow Performance Through Two Parities (1988), R C. Thaler, G L. Allee, Jim L. Nelssen, Robert D. Goodband Jan 1988

Effect Of Dietary Folic Acid Additions On Sow Performance Through Two Parities (1988), R C. Thaler, G L. Allee, Jim L. Nelssen, Robert D. Goodband

Kansas Agricultural Experiment Station Research Reports

A total of 153 gilts from three breeding groups were fed gestation/lactation diets supplemented with either 0, 1.5, or 6.0 g of folic acid/ton of complete feed for two consecutive parities. Serum folate levels were linearly increased by dietary additions of folic acid throughout gestation and lactation, but serum glucose and urea levels were unaffected by treatment. Stage of life cycle also had an effect on serum folate level. Generally, folate levels decreased from breeding to day 60 of gestation in parity 1 for all treatments, then increased through lactation. In parity 2, folate levels decreased up to day 90 …

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Horn Fly And Face Fly Control With The Dustacator® Combination Mineral Feeder And Livestock Dusting Device, Donald E. Mock, R.R. Schalles Jan 1988

Horn Fly And Face Fly Control With The Dustacator® Combination Mineral Feeder And Livestock Dusting Device, Donald E. Mock, R.R. Schalles

Kansas Agricultural Experiment Station Research Reports

Dustacators (combination mineral feeders and livestock dusting devices) were used for four beef herds at Kansas State University in 1985. Loose mineral was supplied in all four Dustacator tubs, which were adjusted to low settings. Permethrin dust had no apparent effect on horn flies. Co-Ral® from two sources and Rabon® provided approximately 65% horn fly reduction during the 53-day test period. The 1986 experiment compared the effects of Dustacator mineral tub height adjustments and loose vs. block mineral. Co-Hal 1% dust from a single source was used in all treatments on two Simmental herds and two Polled Hereford herds. Excellent …

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Effect Of Limited - Creep Feeding On Performance Of Spring-Born Calves, D. Simms, Gerry L. Kuhl Jan 1988

Effect Of Limited - Creep Feeding On Performance Of Spring-Born Calves, D. Simms, Gerry L. Kuhl

Kansas Agricultural Experiment Station Research Reports

Three limited-creep feeding trials were conducted with spring-born suckling calves on native grass. The 1696 crude protein, high energy creep feed containing Bovatec® was fed from mid-August to weaning in mid-October. Limited-creep feeding increased (P<.05) calf gains .19 lb per/head/daily with an average daily consumption of 2.15 lb, giving a creep feed-to-gain conversion rate of 11.2.

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Morning Versus Evening Supplementation For Heifers Grazing Winter Range, E. Vanzant, B. Cochran, L. Corah, K. Zoellner Jan 1988

Morning Versus Evening Supplementation For Heifers Grazing Winter Range, E. Vanzant, B. Cochran, L. Corah, K. Zoellner

Kansas Agricultural Experiment Station Research Reports

Supplementing developing heifers in the morning was compared with supplementation at sundown. No difference was evident among treatments in average daily gain, distance traveled, or time spent grazing.

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Effect Of Depo-Mga On The Prevention Of Pregnancy In Grazing Heifers, L.R. Corah, F.K. Brazle, G.W. Boyd, T. Goehring Jan 1988

Effect Of Depo-Mga On The Prevention Of Pregnancy In Grazing Heifers, L.R. Corah, F.K. Brazle, G.W. Boyd, T. Goehring

Kansas Agricultural Experiment Station Research Reports

Two field trials were conducted to evaluate various dosage levels of Depo-MGA® for preventing pregnancy in grazing heifers. Injecting Depo-formulated MGA subcutaneously in the ear at dosages of 60, 90 or 120 mg effectively prevented pregnancy for up to 135 days. There was no effect on average daily gain.

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The Effect Of Physical Characteristics On The Price Of Stocker And Feeder Cattle, F. Brazle, J. Mintert, Ted C. Schroeder, O. Grunewald Jan 1988

The Effect Of Physical Characteristics On The Price Of Stocker And Feeder Cattle, F. Brazle, J. Mintert, Ted C. Schroeder, O. Grunewald

Kansas Agricultural Experiment Station Research Reports

A survey of feeder cattle sales was conducted at seven Kansas cattle auctions during 1986 and 1987. A wide variety of physical characteristics was found to influence feeder cattle prices. The price impact resulting from changes in fill and condition varied seasonally. Although calves showing any signs of health problems received severe price discounts, the presence of other undesirable characteristics also resulted in discounts, but to lesser degrees.

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The Effect Of Physical Characteristics On Cow Price Differentials In Kansas, F. Brazle, J. Mintert, Ted C. Schroeder, O. Grunewald Jan 1988

The Effect Of Physical Characteristics On Cow Price Differentials In Kansas, F. Brazle, J. Mintert, Ted C. Schroeder, O. Grunewald

Kansas Agricultural Experiment Station Research Reports

A survey of cow sales was conducted in the fall of 1986 and spring of 1987 at seven Kansas cattle auctions. Several factors significantly influenced cow prices, including health, estimated dressing percentage, lot size, breed, and time of sale. Changes in dressing percentage explained the major portion of cow price variation.

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Effect Of Fat Source On Performance And Carcass Quality Of Finishing Steers, Robert T. Brandt Jr. Jan 1988

Effect Of Fat Source On Performance And Carcass Quality Of Finishing Steers, Robert T. Brandt Jr.

Kansas Agricultural Experiment Station Research Reports

Two trials that utilized 356 steers were conducted to evaluate the effects of various fat sources (3.596 of ration dry matter) on performance and carcass traits of finishing cattle fed flaked milo diets. In trial 1, soybean oil, bleachable tallow, and yellow grease (blend of tallow and restaurant grease) were compared to a nonfat control. Feeding fat increased (P<.05) daily gain, feed efficiency, carcass weight, and dressing percent of steers. Soybean oil and yellow grease also tended to increase 12th rib backfat thickness and marbling. Feed costs of gain were improved only by yellow grease. However, when increased carcass yield and quality were considered, there was a significant economic return from all fat sources. In trial 2, fat treatments were acidulated soybean soapstock (SBSS), tallow, a blend of 7096 SBSS:3096 tallow, and yellow grease. Feeding tallow or the SBSS: tallow blend improved (P<.05) feed efficiency by 7.796 compared to the nonfat control. Pooled across source, feeding fat increased (P<.10) backfat thickness and marbling. Compared to the control, feed cost of gain was reduced 6 cents/l b by the SBSS:tallow blend. However, when increased carcass value was accounted for, net returns of $3.50 to $6.00 per head were seen for SBSS, tallow, and SBSS:tallow priced at 13, 17, and 13 cents per lb, respectively. The SBSS:tallow blend provided greater performance than was predicted by observed performance of steers fed SBSS or tallow separately, an indication of associative response. In trial 2, intake and gain were lowest for yellow grease, resulting in a negative economic return, which is in complete disagreement with results obtained in trial 1.

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Serum Cholesterol Concentrations In Yearling Bulls, G. Goldy, W. Olsen, Jack G. Riley Jan 1988

Serum Cholesterol Concentrations In Yearling Bulls, G. Goldy, W. Olsen, Jack G. Riley

Kansas Agricultural Experiment Station Research Reports

A wide range in serum cholesterol concentrations was observed within and between all four breeds of yearling bulls studied. The significance of this observation is unknown at this time. Addition research is necessary to determine the heritability of serum cholesterol, and the relationship between serum cholesterol of sires and the tissue cholesterol of their progeny.

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Testing Feedstuffs Using Near-Infrared Reflectance Spectroscopy (Nirs), P.C. Dubois, L.H. Harbers Jan 1988

Testing Feedstuffs Using Near-Infrared Reflectance Spectroscopy (Nirs), P.C. Dubois, L.H. Harbers

Kansas Agricultural Experiment Station Research Reports

Over 16 years ago, an analytical instrument was developed that could rapidly determine the concentration of organic compounds from the spectra produced by the bonding between certain molecules. The instrument is based on the principle that those molecules absorb electromagnetic radiation in the infrared region. Compounds may be quantitated by using a computer to compare absorption bands in the near-infrared spectrum to those from a large calibration set of known composition. Peaks from compounds such as water, protein, fat, and carbohydrate may be translated into nutrient components such as moisture, crude protein, crude fat, acid detergent fiber, etc. all this …

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Yield, Chemical Composition, And Feeding Value Of Winter Cereal Silages And Hays: A 3 Year Study, S. Azimi, K. Bolsen, A. Laytimi, S.H.M. Esmail, J. Hoover, Q.K. Ye Jan 1988

Yield, Chemical Composition, And Feeding Value Of Winter Cereal Silages And Hays: A 3 Year Study, S. Azimi, K. Bolsen, A. Laytimi, S.H.M. Esmail, J. Hoover, Q.K. Ye

Kansas Agricultural Experiment Station Research Reports

Three trials were conducted to compare silage and hay yields and feeding values of winter cereal foraged harvested in the boot and dough stages of maturity. Included were triticale; common rye; Kanby barley; and Centurk, Arkan, and Bounty 205 wheats. As expected, forage dry matter (DM) yields were higher at the dough stage then boot stage, and silage yields tended to be higher than those for hay. In Trials 2 and 3 (1986-87), barley and rye forage yields were lower than wheat yields. In all three years, wet weather conditions made hay-making difficult. In Trial 1, cattle performance from dough …

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Effect Of Enzyme And Inoculant Additives On Preservation And Feeding Value Of Wheat And Forage Sorghum Silages, A. Laytimi, K. Bolsen, J. Schurhammer, B. Kirch Jan 1988

Effect Of Enzyme And Inoculant Additives On Preservation And Feeding Value Of Wheat And Forage Sorghum Silages, A. Laytimi, K. Bolsen, J. Schurhammer, B. Kirch

Kansas Agricultural Experiment Station Research Reports

Enzyme and inoculant additives produced more efficiently preserved wheat and forage sorghum silages and improved their feeding value. In general, treated silages had lower pH, acetic acid, and ammonia-nitrogen values and higher lactic acid and lactic to acetic acid ratios than untreated silages. In two of the three trials, cell wall and acid detergent fiber fractions were lower in treated than untreated silages. In Trial 2, the treated sorghum silages were extremely unstable in air and cattle performance was similar for control and treated silages. In Trial 3, gains and feed conversions in steers were improved for those fed treated …

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Errors In Heat Detection Are Costly (1988), Jeffrey S. Stevenson Jan 1988

Errors In Heat Detection Are Costly (1988), Jeffrey S. Stevenson

Kansas Agricultural Experiment Station Research Reports

Attention to heat detection will decrease reproduction losses and costs associated with extended calving intervals and high culling rates. Errors in diagnosing heat (errors of commission) and missed heats (errors of omission) are the major errors of a heat detection program. Priority must be given to heat detection to improve reproductive efficiency and reduce the costs of reproductive failure on dairy farms.; Dairy Day, 1988, Kansas State University, Manhattan, KS, 1988;

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The Evaluation Of Rapid Methods For Monitoring Free Fatty Acid Levels In Cheese (1988), W.G. Ikins, H.S. Kwak, G.S. Zink, I.J. Jeon Jan 1988

The Evaluation Of Rapid Methods For Monitoring Free Fatty Acid Levels In Cheese (1988), W.G. Ikins, H.S. Kwak, G.S. Zink, I.J. Jeon

Kansas Agricultural Experiment Station Research Reports

The amount of free fatty acids present in cheese is important to dairy processors because these compounds make a significant contribution to the overall flavor. In this study, the results obtained using three relatively rapid methods of determining free fatty acids concentrations in cheese were compared to those acquired by using a more laborious but accurate gas chromatographic technique. One method, the Extraction-Titration Method, was found to be superior to the others because of its simplicity and reliability. In addition, the values obtained by this method were found to closely correlate with short chain fatty acid concentrations of cheese as …

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Bovine Recombinant Interleukin-2 Enhances Resistance To Bovine Herpesvirus-1: Dose Response Trial (1988), P.G. Reddy, Frank Blecha, J.L. Morrill, H.C. Minocha Jan 1988

Bovine Recombinant Interleukin-2 Enhances Resistance To Bovine Herpesvirus-1: Dose Response Trial (1988), P.G. Reddy, Frank Blecha, J.L. Morrill, H.C. Minocha

Kansas Agricultural Experiment Station Research Reports

Twenty-five calves were allotted to five groups: controls that did not receive bovine recombinant interleukin-2 (rIL-2) and four groups that received 5 daily injections of rIL-2 at 11.4, 1.1,0.11, or 0.0 II µg/lb/day. On day 0 of the experiment, all calves received bovine herpesvirus-I (BHV-1) vaccine and the first of the 5 daily injections of bovine rIL-2. All calves were infected with BHV-Ion day 21 of the experiment. Calves treated with 11.4 µg /Ib/day had elevated rectal temperatures and mild diarrhea during administration of rIL2. All other calves were normal. Compared to control calves, those treated with 11.4, 1.1, and …

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Timing Of Parturition In Dairy Cattle (1988), Jeffrey S. Stevenson Jan 1988

Timing Of Parturition In Dairy Cattle (1988), Jeffrey S. Stevenson

Kansas Agricultural Experiment Station Research Reports

A recent survey of calvings of dairy heifers and cows revealed that fall calvings occurred in a nonrandom pattern. The survey was conducted in a large 5,000-cow herd in which pregnant females were watched 24 hr/day. Fewer (P<.005) calves (42%) were born during the night-time hours of darkness (6 p.m. to 6 a.m.) than during daylight hours (58%). The time of day when calving occurred was unrelated to the duration of pregnancy or to any of the climatic variables measured, including daily temperatures (highs or lows), barometric pressure, relative humidity, precipitation, average wind velocity, or percentage of sunshine. Although some reports and popular opinion have suggested that time of calving might be influenced partly by prevailing weather conditions, our data fail to support this notion. We are unable to explain the observed nonrandom pattern of calving, except that it might be influenced by other management routines on the farm.; Dairy Day, 1988, Kansas State University, Manhattan, KS, 1988;

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Effect Of Hay Quality And Breed On The Onset Of Puberty And Subsequent Reproductive Performance In Beef Heifers, R.C. Perry, L.R. Corah, R.C. Cochran, J.R. Brethour Jan 1988

Effect Of Hay Quality And Breed On The Onset Of Puberty And Subsequent Reproductive Performance In Beef Heifers, R.C. Perry, L.R. Corah, R.C. Cochran, J.R. Brethour

Kansas Agricultural Experiment Station Research Reports

The effect of hay quality on the onset of puberty and subsequent reproductive performance was evaluated in 51 3/4 Hereford x 1/4 Angus (HA) heifers and 47 3/4 Hereford x 1/4 Brahman (HB) heifers. Two qualities of alfalfa hay were fed ad libitum. along with an average of 3.1 lbs/hd/day of ground sorghum grain. HB heifers were heavier and carrying more backfat and body condition (P<.05) at the start of the experiment and they maintained their weight advantage through out the experiment. A higher (P<.05) percent of the UB heifers reached puberty by 14 and 15 months of age and became pregnant during a 45 day artificial insemination breeding period. HA heifers reached puberty at a lighter (P<.05) average weight. Heifers fed high quality alfalfa hay were heavier (P<.05) by the start of the breeding season and were carrying more (P<.05) backfat and body condition. A higher percent (P=.08) of the heifers receiving higher quality hay reached puberty by 16 months of age and a higher (P=.10) percent became pregnant during the breeding period. Heifers inseminated at their pubertal estrus had lower (P=.04) first service conception rates than heifers inseminated at their second or later estruses (52% vs. 88%).

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