|Statement||organized by the British Society of Animal Science and held at Antrim in November 1994 ; edited by T.L.J. Lawrence, F.J. Gordon and A. Carson ; technical editors Hilary Davies and Marie C. Pitkethley.|
|Series||BSAS occasional publication -- no. 19|
|Contributions||Lawrence, T. L. J., Gordon, Frederick James., Carson, A., British Society of Animal Science.|
Dairy cattle breeding is the process of selecting and mating individuals in accordance with breeding goals, with the aim of changing genetic merit of future generations and bringing about an improvement in economic efficiency. For instance, a breeding goal may be designed to . Additional Physical Format: Online version: Johansson, Ivar, Genetic aspects of dairy cattle breeding. Urbana, University of Illinois Press, as the cow metabolises the extra protein. Avoid feeding high protein diets during the breeding season. Magnesium deﬁciency Dairy cows are at high risk of grass tetany (staggers) particularly on lush grass rich in potassium and nitrogen in cold, wet, conditions. It can also occur on autumn grass. Cows need to be supplemented with 30g of File Size: KB. evidence that high genetic merit dairy cows actually contribute more to farm profit in practice. Using historical financial data collected as part of the Dairy Farm Monitor (DFM) Project, and historical cow production, health and mating records, a method was developed to compare the.
Acquiring or raising high quality replacement heifers is an essential and major investment for the cow-calf producer. The replacement heifer becomes the genetic building block for the cow herd. The producer hopes that a replacement heifer will become a fertile cow . Dairy Breeding and Genetics Breeding high quality cattle using good genetics is at the heart of profitable dairy farming. Genetics can help build milk production as well as health and management traits into your herd and any decisions are cumulative, building over the generations. So cows with fertility BVs of 0% have the same genetic merit for fertility as the base cows born in In comparing cows with fertility BVs of +5% (high genetic merit for fertility) with cows with fertility BVs of -5% (low genetic merit for fertility), you can expect 10 more high-merit cows per hundred to re-calve in the first 6 weeks of the. Breeding Management Excellence in breeding management underpins profitability on Irish dairy farms. Nationally only 58% of the dairy herd calves in the first six weeks of the calving season in a calving interval of days: the Teagasc targets are 80% calved .
Milk yield. Dairy cattle selection programs have traditionally focused on increasing total lactation milk yield. Fig. shows the average milk yield per cow per year between and in the US Holstein dairy herd. Notably, average annual milk production has increased from ab to 28, lb in the last 60 years ().Interestingly, much of this improvement in productivity is due to. Whilst most beef and dairy breeds are well suited to outdoor systems, in beef production the use of traditional, early maturing breeds will probably better suit a forage-based system. It may also be the case that high-yielding, high genetic merit dairy cows would be unsuited for largely forage-based feeding . Genotype X environment interactions in dairy cattle: a New Zealand perspective. In BSAS Occasional Publication Breeding and Feeding the High Genetic Merit Dairy Cow (ed. by TLJ Lawrence, FJ Gordon and A Carson), pp. 51 – British Society of Animal Science, Midlothian, UK. Genotype by environment interaction – experience from Langhill. In Breeding and feeding the high genetic merit dairy cow (ed. TLJ Lawrence, FJ Gordon and S Carson), BSAS occasional publication no. 19, pp. 59 – British Society of Animal Science, Edinburgh, UK.