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Department of Animal Science: Faculty Publications

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Full-Text Articles in Animal Sciences

Evaluation Of Sires Available Through Planned Mating, L. Dale Van Vleck, C. R. Henderson, H. W. Carter Jan 1962

Evaluation Of Sires Available Through Planned Mating, L. Dale Van Vleck, C. R. Henderson, H. W. Carter

Department of Animal Science: Faculty Publications

There is some concern that methods of sire evaluation which utilize contemporary stablemate averages can be biased by differential genetic merit of the mates of these sires. A little reflection, however, indicates that even if the cows to which some sires are mated are more highly selected than the mates of other sires, this differential merit will not affect seriously the ranking of sires according to the evaluation of their progeny. Until the present, data have not been readily available with which to study the seriousness of this problem. The present study does not deal with the question generally, but …

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Sire Evaluation From Five-Month Daughter Records, L. Dale Van Vleck Jan 1962

Sire Evaluation From Five-Month Daughter Records, L. Dale Van Vleck

Department of Animal Science: Faculty Publications

The chief advantages of sire evaluation based on five-month daughter records are: 1. Genetic progress is inversely proportional to the turnover rate in testing bulls so that if this interval is shortened by 10%, the rate of genetic progress will be increased by 11%. The turnover period can be shortened with the use of 5-month records from about 50 months to 45 months—a decrease of 10% in time. 2. Genetic progress is also related to how many top bulls are saved and how many poor ones are culled out of all those sampled. In other words, the more bulls tested …

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Effect Of Levels Of Meat And Bone Scraps On Growth Rate And Feed Efficiency Of Growing-Finishing Swine, E. R. Peo, Jr., D. B. Hudman Jan 1962

Effect Of Levels Of Meat And Bone Scraps On Growth Rate And Feed Efficiency Of Growing-Finishing Swine, E. R. Peo, Jr., D. B. Hudman

Department of Animal Science: Faculty Publications

Many investigations have shown that soybean meal when properly supplemented can replace meat and bone scraps as a major source of protein in swine rations (Lepley et al., 1950; Terrill et al., 1954; Rohlf, 1954; Meade and Hanson, 1957; Meade et al., 1958; Becker et al., 1960). The importance of this finding is emphasized by the work of Bloss et al. (1953), Terrill et al. (1954), Meade and Teter (1957) and Becker and Jensen (1961) who reported a significant depression in growth rate and feed efficiency of swine fed rations containing relatively high levels …

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Parameters For Milk Yield And For Percents Of Ash, Dry Matter, Fat And Protein In Sows, W. G. Pond, L. Dale Van Vleck, D. A. Hartman Jan 1962

Parameters For Milk Yield And For Percents Of Ash, Dry Matter, Fat And Protein In Sows, W. G. Pond, L. Dale Van Vleck, D. A. Hartman

Department of Animal Science: Faculty Publications

Milk was collected separately by machine from four to six glands on nine Yorkshire and Berkshire sows 2 or 3 days after farrowing and at weekly intervals throughout 6 weeks of lactation. Milk yield was measured following intramuscular injection of oxytocin, and the percent of ash, dry matter, fat and protein in the milk from each gland was determined. The average milk yield per gland, following a 1-hour period during which the pigs had been removed from the sow reached a peak of 74.6 gm. 3 weeks after farrowing. The ash content was 0.79% 2 or 3 days after farrowing, …

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Components Of Variance Associated With Milk And Fat Records Of Artificially Sired Holstein Daughters, L. Dale Van Vleck, L. H. Wadell, C. R. Henderson Jan 1961

Components Of Variance Associated With Milk And Fat Records Of Artificially Sired Holstein Daughters, L. Dale Van Vleck, L. H. Wadell, C. R. Henderson

Department of Animal Science: Faculty Publications

Components of variance are estimated for the three-way classification analysis of variance of DHIA reported first and second milk and fat records of artificially sired Holstein cows and of Owner-Sampler reported milk and fat records of artificially sired Holstein cows. The total variance of milk and fat records is partitioned into the following components with the approximate percent of total variance: sire, 6%; year-season, 2%; herd, 30%; sire by year-season, 0%; sire by herd, 1–2%; herd by year-season, 6–8%; sire by herd by year-season, 1–7%; and residual, 50%.

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The Number Of Daughter-Dam Pairs Needed For Estimating Heritability, L. Dale Van Vleck, S. R. Searle, C. R. Henderson Jan 1960

The Number Of Daughter-Dam Pairs Needed For Estimating Heritability, L. Dale Van Vleck, S. R. Searle, C. R. Henderson

Department of Animal Science: Faculty Publications

The number of observations required to obtain reliable estimates of heritability has been discussed recently for the method which utilizes the intra-class correlation coefficient. Wearden (1959) has made use of the power function to determine the number of progeny per sire needed to estimate heritability. Tallis (1959), utilizing the formula for the variance of the intra-class correlation coefficient as given by Fisher (1952), has discussed the minimum number of offspring necessary for estimating heritability with a given accuracy.

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Carcass Characteristics Of Swine As Influenced By Levels Of Protein Fed In Pasture And In Dry Lot, D. B. Hudman, E. R. Peo, Jr. Jan 1960

Carcass Characteristics Of Swine As Influenced By Levels Of Protein Fed In Pasture And In Dry Lot, D. B. Hudman, E. R. Peo, Jr.

Department of Animal Science: Faculty Publications

Several experiments have been conducted to compare the performance of growing-finishing swine fed on pasture and in dry lot. Most of the early experimental research was conducted with rations that were lacking in vitamin and antibiotic supplementation. In these experiments the pigs fed on pasture tended to gain faster and more efficiently than those fed in dry lot. However, more recent research conducted by Hutchinson et al. (1955, 1956), Conrad and Beeson (1957) and Barnhart, Overfield and Lowry (1959) indicates that with supplemental vitamins and antibiotics, pigs fed in dry lot gained slightly faster than pigs fed on pasture.

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Ratios Of Dried Skim Milk And Dried Whey For Pig Starter Rations, D. M. Danielson, E. R. Peo, Jr., D. B. Hudman Jan 1960

Ratios Of Dried Skim Milk And Dried Whey For Pig Starter Rations, D. M. Danielson, E. R. Peo, Jr., D. B. Hudman

Department of Animal Science: Faculty Publications

Lactose and sucrose were reported by Hudman (1956) to be preferred carbohydrates for pig starter rations. Lactose gave the best growth response when fed with soybean oil meal; sucrose with milk protein. From the analysis listed by Morrison (1956), both dried skim milk and dried whey must be considered as a source of lactose since, on an average, these products contain 51.1 and 70.1% lactose, respectively. In addition, both contain a high quality protein.

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Supplementation Of Pig Starters With Thyroprotein, E. R. Peo, Jr., D. B. Hudman Jan 1960

Supplementation Of Pig Starters With Thyroprotein, E. R. Peo, Jr., D. B. Hudman

Department of Animal Science: Faculty Publications

It has been reported that both gains and feed efficiency are improved when pigs are fed thyroprotein during the growth period from weaning to market weight (Reineke et al., 1948; Beeson et al., 1949; Perry et al., 1950; Perry et al., 1951). Contrary results have been reported by Braude (1947), Muhrer et al. (1947) and Vander Noot et al. (1948). No similar research has been reported with baby pigs during

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Grain Sorghum For Growing-Finishing Swine, E. R. Peo, Jr., D. B. Hudman Jan 1958

Grain Sorghum For Growing-Finishing Swine, E. R. Peo, Jr., D. B. Hudman

Department of Animal Science: Faculty Publications

Considerable research has been conducted on the feeding value of grain sorghums for swine. Baker and Reinmiller (1939) observed that for the production of gains, grain sorghums were equal to or better than corn but considerable more feed was required to produce a pound of gain with the sorghums. Loeffel (1957) summarized several Nebraska swine experiments and observed that grain sorghum and corn produced approximately the same average daily gain, but, in general, 10 to 20~o more feed was required per pound of gain with the grain sorghum. Similar results have been reported by Aubel (1950, 1954, 1955, 1956) and …

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Protein And Fat Requirements Of Baby Pigs, E. R. Peo, Jr., G. C. Ashton, V. C. Speer, D. V. Catron Jan 1957

Protein And Fat Requirements Of Baby Pigs, E. R. Peo, Jr., G. C. Ashton, V. C. Speer, D. V. Catron

Department of Animal Science: Faculty Publications

Present day research in swine nutrition with its early weaning programs and its use of the baby pig in biological assays has necessitated the determination of the nutritional requirements of the baby pig. The requirements for two of these nutrients (protein and fat) have not been clearly established. Early studies on the protein and fat requirements of baby pigs were conducted with liquid synthetic milk diets, which were formulated generally on the basis of the composition of sow milk.

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Recent Lamb Feeding Investigations At The University Of Nebraska, H. J. Gramlich Oct 1917

Recent Lamb Feeding Investigations At The University Of Nebraska, H. J. Gramlich

Department of Animal Science: Faculty Publications

During the past several years considerable experimental work has been performed at the University of Nebraska in fattening western lambs. The attractiveness of fattening lambs at prices existing during a series of recent years has caused a material increase in the interest in this work, and we have felt justified in experimenting rather extensively to ascertain the most satisfactory combination of feeds to use under our Nebraska conditions.
The objects in view have been chiefly to ascertain the most satisfactory rations where corn and alfalfa hay constituted the basal feeds. We have used these two feeds extensively because of the …

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