The aim of the study is to identify frequency occurrence various allelic variants and genotypes beta-casein in cows Kholmogory breed their relationship with dairy productivity. tasks research are genotyping cattle by locus establishing its connection qualitative quantitative indicators As objects for there were taken 150 1st, 2nd 3rd lactation. An allele-specific variant PCR method (AS-PCR) was...

BACKGROUND Postmenopausal osteoporosis is a common disease which can cause various morbidity and economic burden. Lactation is known to cause a decline in bone mineral density (BMD), but there are controversies on whether decreased BMD is fully recovered after lactation and whether lactation duration has an influence on postmenopausal BMD. This study was conducted to see whether breastfeeding i...

Different classification machine learning techniques (Naïve Bayes, Random Forest and Extreme Gradient Boosting) were evaluated to identify cows positive for clinical mastitis (CM) during their first lactation (1st lactation) daily predict the onset of CM (continuous). Integrated data from different software used feed algorithms. In both cases, best predictions obtained with algorithm. The algor...

Dominating in recent years Bulgaria are the sheep from Bulgarian Dairy Synthetic Population (BDSP) and its crosses with other dairy breeds. This turn leads to significant, scientifically based genetic phenotypic diversity different levels of productivity. The aim study is research characterize genotypic parameters main productive reproductive traits synthetic population breeds Lacaune Assaf. in...

the aim of the present study was to compare the occurrence and duration of clinical mastitis in different seasons, stages of lactation period and parities in a holstein dairy farm in iran. a retrospective epidemiological survey from april 2005 to march 2008 was conducted on 884 clinical mastitis cases of 7437 lactations. data of each case including calendar-date of mastitis onset, days in milk ...

OBJECTIVE Human milk (HM) is the ideal food for all newborns and infants. Apart from various bioactive compounds, including cytokines, antibodies, hormones, vitamines, it also contains polyamines, such as spermine (Sp), spermidine (Spd) and putrescine (Put). AIM The present study investigated polyamine metabolism in colostrum and mature human milk by measuring the polyamine oxidase (PAO) and ...

The prevalence of subclinical hypocalcemia in the transition cow is unknown. Cows with subclinical hypocalcemia have no clinical signs of hypocalcemia but may be more susceptible to other diseases. The objective of this study was to determine the prevalence of subclinical hypocalcemia in the US dairy herds. As a part of the United States Department of Agriculture's National Animal Health Monito...

Rubber flooring in dairies has become popular because of perceived cow comfort. The objective of this longitudinal study was to evaluate locomotion, stress, and immunity over the first 180d of each of the 1st and 2nd lactations of cows assigned to free-stall housing with either rubber (RUB) or concrete (CON) at the feed-alley of their housing. Cows entered the experiment at d −60 before 1st (n ...

The objectives were to estimate (co)variance components and genetic parameters for lactation curve traits in Holstein dairy cows in Iran. The used data were records on Holstein cows collected during January 2003 to December 2012 by the Animal Breeding Center of Iran (Karaj, Iran). In order to describe the lactation curve, an incomplete gamma function was fitted to 691200 test-day records on 962...