The present study aims to examine the effect of tropical temperatures on autonomic nervous activity in Cambodian dairy cattle by analyzing heart rate variability (HRV). Holter-type electrocardiograms were recorded in adult crossbred cows (Cambodian native × Holstein) either in a sheltered area or under direct sunlight. Rectal temperatures and heart rates increased in animals under direct sunlig...

The present study was conducted to evaluate the effects of physical form of starter and alfalfa hay (AH) provision on growth performance, ruminal fermentation, and blood metabolites of Holstein dairy calves. Forty-four 3d-old Holstein dairy calves with a mean starting BW of 39.9 ± 1.1 kg were used in a 2 × 2 factorial arrangement. The factors were dietary forage level (0 or 150 g kg-1</sup...

The development of breeding tools, such as genomic selection and sexed semen, has progressed rapidly in dairy cattle during the past decades. In combination with beef these tools are adopted increasingly at herd level. Dairy crossbreeding is emerging, but economic genetic consequences combining it other relatively unknown. We investigated 5 different semen schemes where 0, 50, 90% heifers; 50% ...

The level of performance in any livestock production enterprise is a function genetic and non-genetic factors their interaction. For the purpose agricultural decisions, Zimbabwe was divided into five agro-ecological zones (AEZ) according to rainfall intensity, distribution length rainy season. Commercial dairy production, based on specialist breeds such as Holstein, Holstein-Friesian Jersey, co...

Body weight and fat mass vary distinctly between German Holstein (dairy cattle) and Charolais (beef cattle). The aim of this study was to determine whether the expression of the obese (Ob) gene and lipoprotein lipase (LPL) gene in fat tissues and expression of the long isoform leptin receptor (Ob-Rb) gene in the hypothalamus were different between these two cattle breeds. Body weight and the ar...

Previous research demonstrated significant variation in the prevalence of Salmonella in peripheral lymph nodes (LNs) of feedlot cattle and cull cows, with greater prevalence in feedlot cattle. Therefore, we performed experiments to investigate whether these differences in Salmonella prevalence in subiliac LNs are due to, or influenced by, breed, which in many respects is a proxy for the product...

We herein demonstrate that in the Holstein-Friesian dairy cattle population, microsatellites are as polymorphic on the X chromosome as on the autosomes but that the level of linkage disequilibrium between these markers is higher on the X chromosome than on the autosomes. The latter observation is not compatible with the small male-to-female ratio that prevails in this population and results in ...

This study presented a potentially useful alternative approach to ascertain the presence of subclinical and clinical mastitis in dairy cows using support vector machine (SVM) techniques. The proposed method detected mastitis in a cross-sectional representative sample of Holstein dairy cattle milked using an automatic milking system. The study used such suspected indicators of mastitis as lactat...

There is a lack of information on genetic parameters for tuberculosis (TB) susceptibility in dairy cattle. Mycobacterium bovis is the primary agent of tuberculosis in cattle.The objective of this study was to quantify the genetic variation present among Irish Holstein Friesian dairy cattle in their susceptibility to M. bovis infection. A total of 15,182 cow and 8,104 heifer single intradermal c...