The aim of the research is to study probability manifestation haplotype fertility AH1 in Ayrshire sires with different variants presence AH1C male ancestors first four rows their pedigree. Materials and methods. material was data electronic database created at RRIFAGB on 74 sire breed Russia, which 22 are carriers genetic defect - AH1C, rest free AH1F. To find patterns tested bulls, we analyzed...

Daily methane production and feed intake were measured on 160 adult ewes, which were the progeny of 20 sires and 3 sire types (Merino, dual-purpose and terminal) from a genetically diverse flock. All animals were housed in individual pens and fed a 50/50 mix of chaffed lucerne and oaten hays at 20 g/kg liveweight (LW), with feed refusals measured for at least 10 days before the first of three 2...

A posteriori and modified granddaughter designs were applied to determine haplotype effects for Holstein bulls and cows with BovineSNP50 [~50,000 single nucleotide polymorphisms (SNP); Illumina Inc., San Diego, CA] genotypes. The a posteriori granddaughter design was applied to 52 sire families, each with ≥100 genotyped sons with genetic evaluations based on progeny tests. For 33 traits (milk, ...

Numerous meat sheep breeding programs in developed and developing countries are characterized by incomplete sire information a predominant use of natural matings. These two parameters potentially affect the benefit genomic selection (GS), especially for late-in-life trait. Using stochastic simulations, genetic gains obtained using conventional strategies maternal trait were evaluated population...

Can we predict what a young sire’s proof will be before he has milking daughters? Afrequent argument made against using a young sire is that we don’t know what his production proof will be until after he has milking daughters. This is not entirely true. AI organizations select young sires for progeny sampling based on pedigree merit. One common measure of pedigree merit is parent average. A bul...

The use of terminal sires (TS) for crossbreeding is integral to the UK sheep industry where approximately 71% of market lambs are sired by TS rams. Early growth of these crossbred lambs affects profitability. The objectives of this study were i) to evaluate the effectiveness of index selection among TS on BW and ADG of their crossbred offspring; and ii) to compare the efficacy of that selection...

About 30% of producers use hormone protocols to synchronize ovulation and perform timed artificial insemination (AI) in Canada. Days from calving first service (CTFS) conception (FSTC) become masked phenotypes leading biased genetic evaluations cows for these fertility traits. The objectives this study were (1) demonstrate quantify the potential amount bias evaluations, (2) find a procedure tha...

The objective of this experiment was to provide a current evaluation of the seven most prominent beef breeds in the United States and to determine the relative changes that have occurred in these breeds since they were evaluated with samples of sires born 25 to 30 yr earlier. Carcass (n = 649), yield (n = 569), and longissimus thoracis palatability (n = 569) traits from F(1) steers obtained fro...

Abstract Our objectives were to determine how pre-finishing plane of nutrition, season, and breed beef sire affect performance, efficiency, carcass attributes dairy-beef hybrid calves. Dairy × steers (3 7 d age) maintained on either a moderate nutrition or high from 0 12 wk age. Calves (n = 211, BW 122 ± 16 kg) then transported 689 km the OSU Sparks Beef Research Center at an average age 92 1.6...