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Full-Text Articles in Life Sciences
Sire Effects In Different Housing Systems, G. R. Wiggans, L. Dale Van Vleck
Sire Effects In Different Housing Systems, G. R. Wiggans, L. Dale Van Vleck
Department of Animal Science: Faculty Publications
Over 1,000 Holstein herds in New York's Dairy Herd Improvement Cooperative were classified as to housing system. The two housing systems considered were stanchions and free stalls. First-lactation records (21,285) produced in these herds by daughters sired through artificial insemination were analyzed to determine if housing system would affect sire ranking. The study covered records started in 1964 through 1967.
The sire component of variance was estimated for each housing system for deviations of these records from their adjusted herdmate averages. The covariance between the means of daughters in each housing system was computed. The genetic correlation between sire effects …
Variation Within Herds Under Different Housing Systems, G. R. Wiggans, L. Dale Van Vleck
Variation Within Herds Under Different Housing Systems, G. R. Wiggans, L. Dale Van Vleck
Department of Animal Science: Faculty Publications
New York Holstein herds (1,152) including 75,875 cows were classified by housing system (stanchions, free stalls, and other combinations). Records initiated in these herds from 1964 to 1968 were used to determine the degree to which housing type might affect variance of milk production records in herds with 45 or more cows.
The within-herd variances by lactation for each housing system in each year-season were examined by Bartlett's test for nonhomogeneity among housing systems. Records in the stanchion systems were less variable than those in free-stall systems. This difference was not large enough to require adjustment for type of housing …
Changes In Body Weight And Composition Of Adult Nongravid Female Rats Deprived Of Dietary Protein, W. G. Pond, L. Dale Van Vleck, E. F. Walker Jr., C. F. Eisenhard, J. R. O'Connor
Changes In Body Weight And Composition Of Adult Nongravid Female Rats Deprived Of Dietary Protein, W. G. Pond, L. Dale Van Vleck, E. F. Walker Jr., C. F. Eisenhard, J. R. O'Connor
Department of Animal Science: Faculty Publications
Seventy-six young adult nongravid female rats of the Carworth strain were used in two experiments to study the effect of dietary protein deprivation on body weight, feed consumption, body composition and serum protein concentration. Semipurified diets containing glucose, corn oil, vitamins and minerals with or without casein (protein-free = PF, 14% casein = C) were fed ad libitum in both experiments to rats caged in individual wire-bottom cages. Feeding the PF diet for up to 26 days resulted in a continuous weight loss over the entire period. The average loss in body weight as a percentage of initial weight of …
Relationship Between Type Traits And Longevity Of Daughters Of Hew York Holstein Sires, L. Dale Van Vleck, D. B. Filkins, H. W. Carter, C. L. Hart
Relationship Between Type Traits And Longevity Of Daughters Of Hew York Holstein Sires, L. Dale Van Vleck, D. B. Filkins, H. W. Carter, C. L. Hart
Department of Animal Science: Faculty Publications
The percentage of 40 or more daughters having four lactations of 81 New York Holstein artificially insemination sires was correlated with the percentage of daughters in 66 type categories measured in the first lactation and their average first-lactation milk yield. Multiple regression on these type and production traits accounted for 92% of the variation in percentage of daughters having four lactations. A subset of 33 traits accounted for 82% of the variation. Traits with the largest standard partial regressions for longevity were milk production (.41), udder edema (.87 and .71), deep body (.53), medium upstandingness (.41), fore udder attachment (--.86 …
Sire Evaluation For Economic Merit, J. W. Wilton, L. Dale Van Vleck
Sire Evaluation For Economic Merit, J. W. Wilton, L. Dale Van Vleck
Department of Animal Science: Faculty Publications
Procedures for selecting sires are compared in terms of making maximum genetic progress in economic merit. A quadratic index, a simplified form of the quadratic index and a linear index to evaluate economic merit, and a restricted index to improve milk as much as possible while holding milk fat percentage constant, all result in nearly equal expected genetic progress in economic merit. Selection for milk production results in less expected genetic progress in economic merit, the extent of the decrease depending on the economic value of milk production at a given base test and on the test differential.
Evaluation of …
Levels Of Calcium And Phosphorus For Growing-Finishing Swine, G. W. Libal, E. R. Peo, Jr., R. P. Andrews, P. E. Vipperman, Jr.
Levels Of Calcium And Phosphorus For Growing-Finishing Swine, G. W. Libal, E. R. Peo, Jr., R. P. Andrews, P. E. Vipperman, Jr.
Department of Animal Science: Faculty Publications
The calcium and phosphorus requirements of growing-finishing swine have not been satisfactorily resolved. Recently it was suggested that levels of calcium and phosphorus needed in diets of growing-finishing (G-F) swine for optimum growth and feed conversion may be different from those needed for optimum bone development (Miller et al., 1960; Lloyd et al., 1961; Rutledge et al., 1961; Combs et al., 1966). The problem of determining calcium and phosphorus requirements is further magnified by the observation of Chapman et al. (1955) that G-F swine do not utilize plant phosphorus as efficiently as inorganic phosphorus. In …
Effects Of Dietary Levels Of Manganese And Magnesium On Performance Of Growing-Finishing Swine Raised In Confinement And On Pasture, A. J. Svajgr, E. R. Peo, Jr., P. E. Vipperman, Jr.
Effects Of Dietary Levels Of Manganese And Magnesium On Performance Of Growing-Finishing Swine Raised In Confinement And On Pasture, A. J. Svajgr, E. R. Peo, Jr., P. E. Vipperman, Jr.
Department of Animal Science: Faculty Publications
Research on the optimum dietary levels of manganese and magnesium for growing swine is limited. Johnson (1940) fed pigs diets containing 0.3 to 100 ppm Mn and observed no difference in growth rate. Similarly, Liebholz, Speer and Hays (1962) found that 0.4 ppm Mn in the diet of baby pigs was sufficient to support maximum growth. A level of 4,000 ppm Mn was not toxic but growth rate of the pigs was reduced.
Growth Of Yorkshire Suckling Pigs, W. F. Gipp, W. G. Pond, L. Dale Van Vleck, P. D. Miller
Growth Of Yorkshire Suckling Pigs, W. F. Gipp, W. G. Pond, L. Dale Van Vleck, P. D. Miller
Department of Animal Science: Faculty Publications
The birth weights and daily liveweights for 87 male and 99 female pigs reared under drylot conditions were obtained over a 3-week period and used to construct a growth curve for the very young male and female pig. Analysis of variance was used to test litter and sex main effects and the litter x sex interaction effect on liveweight. The daily standard deviations of the 186 pig sample were calculated and are presented in graphic form. No significant difference between the growth of male and female pigs of this young age were found. The average birth and first-, second- and …