Because a growing proportion of the beef output in many countries originates from dairy herds, most critical decisions about genetic merit carcasses harvested are being made by producers. Interest generation more valuable calves females is intensifying, and likely vehicle use appropriately selected bulls for mating to females. This especially true given potential undertake × matings as herd met...

Dairy farmers and others have been discussing the use of enriched X-bearing semen (sexed semen) for many years (Seidel and Garner, 2002). Sexing bovine semen is possible because X-sperm have 3.8% more DNA than Y-sperm. This difference can be identified with a flow cytometer by staining the sperm with a fluorescent dye that binds to the DNA. The technique is reasonably accurate (10% error rate) ...

Objective- Locomotor disorders are prevalent health problems in dairy herds that negatively affect milk production, reproduction performance and animal welfare. The ultimate cost of locomotor disorders in dairy cattle is substantially greater than treatment costs alone. As limited information is available on incidence of feet and leg disorders in Iran, the objective of this study was to determi...

Mycobacterium avium subsp. paratuberculosis (MAP) is the etiologic agent of paratuberculosis, a disease with considerable economic impact, principally on dairy cattle herds. Animals with paratuberculosis shed viable MAP especially in their milk, faeces and semen. MAP may have a role in the development of Crohn’s disease in humans via the consumption of contaminated milk and milk products. The c...

A related Holstein breed has recently been used to improve domestic dairy cattle and create highly productive herds by purchasing semen from breeding bulls, as well a large number of heifers calves foreign breeding. The purpose the work is comparative assessment qualities Black Pied cows Purebred differ animals in milk yield per lactation 1064 kg or 15.2% (P≤0.01, favor cows). In terms quality ...

OBJECTIVE To determine how iodine deficiency and endemic goitre disappeared in Britain. DESIGN Review of surveys of endemic goitre and iodine nutrition. MAIN RESULTS Endemic goitre was widespread in Britain but has declined, most notably since the 1960's. Its disappearance was probably due to changes in farming practice, especially iodine supplementation in dairy herds which has resulted in...

14 15 In this paper the implementation of a tool was considered, based on Machine Learning (ML) techniques to improve 16 the detection of subclinical mastitis in dairy herds. The analysed population included 71 dairy farms in Asturias 17 (Northern Spain) and a total of 2,407 lactating cows. Four sources of information were available: a) a questionnaire 18 survey describing facilities, milking r...

Despite the importance of quality semen used in artificial insemination to reproductive success dairy herds, few studies have estimated extent genetic variability traits. Even fewer quantified correlation between traits and male fertility. In this study, records 100,058 ejaculates collected from 2,885 Nordic Holstein bulls were estimate parameters for traits, including pre- postcryopreservation...

Bovine viral diarrhoea (BVD) leads to substantial economic losses in beef and dairy herds worldwide. Two case-control studies were carried out using production data from 1996 to 2012 to analyse the impact of BVD virus (BVDV) on fertility in dairy herds in the province of Styria during an eradication programme. In study 1, herds in which at least one persistently BVDV-infected (PI) animal was de...

Achromobacter xylosoxidans, a Pseudomonaslike bacterium, contaminated a boar stud laboratory’s water distillation and delivery system that was used for extension of raw semen for artificial insemination. In sow herds that used the contaminated semen, conception rates decreased and vulvar discharges, culled sows, and nonproductive sow days increased. Thorough diagnostic testing revealed that A x...