Two generations of selection on restricted best linear unbiased prediction breeding values for income minus feed cost in laying hens
Article Abstract:
Five generations of laying hens in a breeding experiment to improve income minus feed cost (IFC) resulted in increased egg weight which adversely affected hatchability. The selection procedure was modified based on restricted BLUP (rBLUP) breeding values in the next two generations to continue selecting for higher IFC while keeping egg weight constant. The restriction reduced genetic gain in IFC from 4.1% to 2.0% in the sixth generation, and from 3.9% to 2.2% in the seventh generation. The average estimate of breeding value for egg weight remained nearly constant after exhibiting strong increase in the first five generations.
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1992
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Additive and nonadditive group genetic effects of serum calcium, phosphorus, and magnesium and weight at weaning
Article Abstract:
The weaning weights (WW) and the amounts of serum calcium (WCa), phosphorus (WP) and magnesium (WMg) at weaning in 380 Angus, Brahman and A x B calves of various expected A and B phenotype fractions were examined. The purpose was to determine the genetic and environmental factors affecting serum macrominerals and weights in a multibreed herd. The results showed genetic effects for WCa, WP, WMg and WW. The results have applications for the genetic evaluation of animals and breed groups and in multibreed production system optimization.
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1992
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Rapid communication: a novel DNA polymorphism of the bovine calpain gene detected by PCR-RFLP analysis
Article Abstract:
The deoxyribose endonucleic acid polymorphism of cattle calpain gene was detected by PCR-RFP analysis. The resulting analysis revealed the presence of three types of genes. Three-banded genotypes with 35% gene frequency were detected. The two-banded genotype has a 25% frequency and the four-banded genotype with a frequency of 40% was also detected. The analysis of additional endonucleases verified the fragment quantity of the 288-bp cDNA sequence. Further analysis has not shown additional genetic variations.
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1996
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