Excellent reproductive performance in both males and females is fundamental to profitable dairy and beef production systems. In this review we undertook a meta-analysis of genetic parameters for female reproductive performance across 55 dairy studies or populations and 12 beef studies or populations as well as across 28 different studies or populations for male reproductive performance. A pleth...

The Bovine Respiratory Disease Complex Coordinated Agricultural Project (BRD CAP) is a 5-year USDA-funded Coordinated Agricultural Project to develop genetic markers associated with bovine respiratory disease (BRD) to identify cattle that are less susceptible to BRD. Ultimately the aim of this project is to integrate predictive markers for BRD susceptibility into genetic tests and national catt...

Herd fertility is a key factor for the sustainability of cattle farming. However, since the 1980s, fertility in dairy cattle has steadily decreased and has become one of the main causes of culling and cow replacement in developed countries (Lucy, 2001; Barbat et al., 2010). Many studies have been performed in the last decades to investigate the genetic bases of this decline, considering the rep...

entrepreneurship has long history in human life and related studies have been conducted primarily in scientific circles by industrialized countries. however, this topic has been discussed recently in our country. the main objective of this study was to assess the behavioral and personality characteristics of entrepreneurship in order to identify entrepreneurs and non-entrepreneurs of dairy catt...

background and objectives: dairy cattle have been implicated as principal reservoir of verotoxin-producing escherichia coli (vtec), with undercooked ground beef and raw milk being the major vehicles of food borne outbreaks. vtec has been implicated as an etiological agent of individual cases and outbreaks in developed countries. this study was designed to determine the prevalence of vetec in di...

one of the most important measures, in order to increase animal products and reduce imports, is the industrialization of animal husbandry units, specially the dairy cattle. the condition of milk production would be improved by this industrialization, which is in the direction of increasing the efficiency of milk production units. the purpose of this study is calculate , the efficiency of the tr...

lactatingdairy cows (n=177) fed with grass and corn silage ad libitum kept in pasture, were randomly assigned to evaluate how urea nitrogen in plasma and milk can be related to their pregnancy rate. blood and milk samples were collected on the artificial insemination (ai) day to evaluate plasma urea nitrogen (pun) and milk urea nitrogen (mun) as well as progesterone levels, excluding cows with ...

AIM In India, dairy industries are important for the livelihood of small scale farmers and dairy owners. Tropical theileriosis, mostly affecting dairy cattle and buffaloes is a major threat to dairy and related industries. Tropical theileriosis is caused by Theileria annulata, a hemoprotozoan parasite transmitted by Ixodid ticks of Hyalomma spp. In the present study, we examined the clinical si...

The most recent issue of the Journal of Dairy Science has several papers regarding decreased fertility in dairy cattle, and the efforts to develop hormonal treatment regimens to improve fertility. Much of the recent work focuses on trying to reduce loss of fetuses during early pregnancy. This prompted me to search the literature about this extensive and important subject area. I suspect that Ut...

BACKGROUND Ethiopia has the largest cattle population in Africa. The vast majority of the national herd is of indigenous zebu cattle maintained in rural areas under extensive husbandry systems. However, in response to the increasing demand for milk products and the Ethiopian government's efforts to improve productivity in the livestock sector, recent years have seen increased intensive husbandr...