Simulation was used to examine the changes that may occur in international dairy sire evaluations when differing amounts of historical performance data are used. When the base genetic variances within each population were equal, use of all historical data in international sire evaluations gave unbiased predictions for breeding values. When some historical data from one population were discarded...

Mortality of laying hens due to cannibalism is a major problem in the egg-laying industry. Survival depends on two genetic effects: the direct genetic effect of the individual itself (DGE) and the indirect genetic effects of its group mates (IGE). For hens housed in sire-family groups, DGE and IGE cannot be estimated using pedigree information, but the combined effect of DGE and IGE is estimate...

Pursuing the community-based breeding program (CBBP) selection of sire for Bonga sheep estimated value by six months body weight, testicle size, and physical characteristics were used as criteria. A study was conducted to investigate association traits with semen estimate their heritability. Data collected from a total 101 adult sires sheep. Semen using artificial vagina processed qualities. Th...

SUMMARY Lactation milk and fat records of 6,949 daughters, 6,201 different dams, and the contemporary D.H.I.A. herd averages of 2,420 herds were studied, to compare five measures of a dairy site's transmitting ability. They were the daughter average, daughter-dam difference, equal-parent index, daughter-contemporary herd difference, and daughter-contemporary-herd index. The daughters and dams w...

Official genetic evaluations for dairy sires have been published in Canada since the winter of 1996. Evaluations are available for five major breeds (Ayrshire, Brown Swiss, Guernsey, Holstein, and Jersey). The most recent evaluation for Holsteins included records from 1,652,884 daughters of 80,197 sires, of which 5900 were eligible for official publication. Published evaluations combine informa...

This study aimed at evaluating the quality of imputation accuracy (IA) by marker (IAm) and individual (IAi) in US crossbred dairy cattle. Holstein × Jersey crossbreds were used to evaluate from a low (7K) medium density (50K) SNP chip. Crossbred animals, as well their sires (53), dams (77), maternal grandsires (63), all genotyped with 78K Seven different scenarios reference populations tested w...

The objective of this project was to determine the genetic control of conception rate, or pregnancy percentage in Angus beef heifers. Producers from 6 herds in 5 states provided 3,144 heifer records that included breeding dates, breeding contemporary groups, service sires, and pregnancy check information. Two hundred fourteen sires of the heifers were represented; with 104 sires having less tha...

Breeds of larger mature size tend to grow more rapidly and be older when attaining a given level of fatness. Hereford, Limousin, and Piedmontese are of approximately equal mature size and yet may vary in body composition at a given degree of maturity. However, direct comparisons among these three breeds were not found. Therefore, the objective of this research was to compare Hereford, Limousin,...

Correlations were computed among averages of first lactation deviations from herdmate averages of groups of artificially sired daughters of the same Holstein bulls. The groups were constructed by specifying the time interval between animals in the different groups. Comparison of the actual correlations with the expected correlations suggests that environmental correlations are small or nil amon...

The present experiment, ‘Regional Combinations’, examined growth, and carcassandmeat-quality traits in the progeny of sires genetically diverse for fatness and meat yield when grown at different rates from weaning to feedlot entry. The present paper is the first of several papers describing results from the New South Wales site, one of four in the project. It reports the effects on growth and b...