The composition and physical nature of milk is very complex. The stability of milk depends upon the different constituent of milk. Determination of heat stability of milk is one of the factors that assess the stability of milk. In this study an attempt was made to measure the heat stability of milk obtained from different varieties of cows and also made an attempt to identify the different comp...

Livestock species can be affected by different types of genetic defects. Recently, we are faced with genetic defects in dairy cattle such as bovine leukocyte adhesion deficiency (BLAD) and complex vertebral malformation (CVM) both are autosomal recessive defects leads to an inherited lethal disease in Holstein breed. BLAD is caused by a deficiency in leukocyte surface glycoproteins known as int...

Data were 876 birth records and 727 weaning records of straightbred and F3 crossbred calves produced in the third generation of a five-breed diallel. Among straightbreds at birth, Holstein calves were heaviest and widest at the shoulders and hips. Jersey calves were lightest and narrowest at the hips, and Brahman calves were narrowest at the shoulders. Holstein crosses tended to be larger at bi...

pedigree information of iranian holstein dairy cattle, collected via animal breeding centre of iran from 1971 to 2007, were utilized to describe the reasons for the increasing inbreed coefficient. inbreeding coefficient (f) and pedigree completeness (pci) of all the available cattle were found out using a pedigree structure of 883713 animals. the herds with pci of above 0.85 were picked out and...

genetic and phenotypic parameters related to production traits, udder conformation and somatic cell count for the iranian holstein cows were estimated. monthly records of somatic cell counts (scc) were primarily transformed into somatic cell scores (scs) and the the average level of lactation period, with correction for milk volume, was calculated. by use of these estimates an udder health inde...

objective: the aim of this study was to select the best medium to maintain sperm motility during sperm-dna incubation and assess the dna uptake by spermatozoa of iranian holstein bulls and its effects on sperm motility. materials and methods: frozen sperms from an iranian holstein bull were thawed and centrifuged. motile sperms were separated through puresperm gradient (40/80%) followed by two ...