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Responses in ovulation rate, embryonal survival, and litter traits in swine to 14 generations of selection to increase litter size.
Eleven generations of selection for increased index of ovulation rate and embryonal survival rate, followed by three generations of selection for litter size, were practiced. Laparotomy was used toExpand
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Environmental effects on neonatal mortality of beef calves.
Calving records from 1969 to 1989 from the Roman L. Hruska U.S. Meat Animal Research Center were used to investigate how climatic conditions, in addition to dystocia, age of dam, size of calf, andExpand
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Genetic and phenotypic parameter estimates for feed intake and other traits in growing beef cattle, and opportunities for selection.
Growth, feed intake, and temperament indicator data, collected over 5 yr on a total of 1,141 to 1,183 mixed-breed steers, were used to estimate genetic and phenotypic parameters. All steers had aExpand
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Identification of quantitative trait loci influencing traits related to energy balance in selection and inbred lines of mice.
Energy balance is a complex trait with relevance to the study of human obesity and maintenance energy requirements of livestock. The objective of this study was to identify, using unique mouseExpand
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Evaluation of the ovine callipyge locus: I. Relative chromosomal position and gene action.
Genotypic and phenotypic data were collected to estimate chromosomal position of the callipyge (CLPG) gene and to test gene action. Nine Dorset rams of extreme muscling phenotype and 114 Romanov ewesExpand
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Divergent selection for heat loss in mice: II. Correlated responses in feed intake, body mass, body composition, and number born through fifteen generations.
Divergent selection for heat loss (kcal.kg-.75.d-1), measured in 9- to 11-wk-old male mice, was conducted for 15 generations. Selection for high (MH) and low (ML) heat loss and unselected controlExpand
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Extended grazing systems for improving economic returns from Nebraska sandhills cow/calf operations
Three winter treatments were cross classified with 2 spring treatments to create 6 feeding and grazing systems utilizing Nebraska sandhills range and subirrigated meadow forage. Systems wereExpand
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Divergent selection for heat loss in mice: I. Selection applied and direct response through fifteen generations.
Divergent selection for heat production/loss (kcal.kg-.75.d-1), measured in 9- to 11-wk-old male mice, was conducted for 15 generations. Heat loss was measured for 15 h on individual animals placedExpand
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Energy requirements for maintenance of crossbred beef cattle with different genetic potential for milk.
Maintenance energy requirements were estimated in two gestation and one lactation feeding trials for three groups of cows. All cows in the second gestation trial completed the first gestation andExpand
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Effect of level of beef cow milk production on pre- and postweaning calf growth.
Three groups of beef cows that were similar in growth and mature size, but different in genetic potential for level of milk provided to their calves, were studied. A procedure for fitting graftedExpand
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