this study utilized daily records of 2000 egyptian holstein dairy cows. the productive, reproductive and economic data during a whole lactation season were recorded for healthy and mastitis cows. two risk factors for mastitis were included, parity and season of calving. mastitis cows had significant (p

the aim of the present study was to screen the genotype profile of bovine kappa-casein gene among frieswal (hf × sahiwal) crossbred cattle developed in india. a total number of two hundred frieswal cows were evaluated for hinfi rflp based genotyping of kappa-casein gene. we observed that only two genotypes (aa and ab) exist among the studied population with the genotype frequency of 0.58 (n=117...

a total of 125 russian red pied cows were genotyped for the prolactim-related gene. the prl-rsai genotypes were analysed using the polymerase chain reaction -restriction fragment length polymorphism (pcr-rflp) method. in this breed, the frequencies of alleles were as follows;  a= 0.794 and b= 0.206. the frequencies of aa, ab and bb genotypes were 0.598, 0.392 and 0.01; respectively. results sho...

the aim of this experiment was evaluating effect of fish oil versus palm oil on mammary gland health and milk production in holstein cows. ten multiparous holstein cows were used from six week before up to 63 days after parturition. feed intake and milk production were recorded daily, milk composition, body weight and body condition score were measured weekly and blood metabolites were determin...

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...

to evaluate the effects of physically processed flaxseed [ground flaxseed (gfs) and whole flaxseed(wfs)] as a replacement for extruded soybeans on feed intake, milk production, milk composition, milk fatty acid (fa) composition and blood biochemical parameters, nine primiparus holstein dairy lactating cowsaveraging 495 ± 34.5 kg of body weight (bw) and 70 ± 5 days in milk (dim) were assigned in...

Decisive heifer management for improved lactation and reduced dystocia requires a systematic analysis of age, body weight (BW), and average daily gain (ADG) using an adequately large sample size. The objective of this study was to determine effects of BW and age at first breeding and ADG until pregnancy on yields of milk, milk fat, and milk protein in the first lactation and the occurrence of d...