The original discovery of the genetic polymorphism of )8-Lg by A s c h a f f e n burg & D r e w r y i n 1955 has initiated considerable research activities on milk protein variants. In view of the immense literature dealing with these subjects, reference should be made here to some comprehensive reviews recently publis­ hed (29, 37, 49, 55, 71). In many studies, possible relationships between m...

The aim of this study was to estimate allelic and genotypic frequencies of five DNA markers that are positional and functional candidates for milk production traits in Czech Fleckvieh cattle. In addition, we evaluated the association of these markers with milk production traits and breeding values for milk production traits and also estimated linkage disequilibrium (LD) between two markers with...

The authors have analysed protein contents, protein fractions, free amino acid and total amino acid contents of the mother’s colostrum and mother’s milk in comparison with the newest publications. They have established that there was no united picture of the different effects on protein contents of the mother’s milk. Protein contents of the colostrum of well-nourished mothers were found 6.0%, w...

seventy six high and low producer cows were selected to determine the composition of theblood and milk parameters, and their interrelationships to determine the indices which could beuseful to improve the milk yield. the highest mean blood concentrations were found in highproducer cows. mean values for blood urea nitrogen (bun), serum protein (sptn), creatinine,triglycerides (tgs), cholesterol,...

The contents of total, free, and bound vitamin B2 (B2) in bovine milk and their distribution in four separate milk fractions, including milk during the early lactation stage, were estimated. The total B2 content in whole mature milk was 179 +/- 25 micrograms/100 g (n = 16), and its distribution in the cream, whey, skim milk membrane, and casein fractions was 6, 67, 9, and 18%, respectively. The...

The objective of our research was to modify the current indirect casein method for bovine milk to enable it to be applied to bovine milk, bovine milk concentrates, and milks of other species that contain a protein concentration up to 9% (wt/wt). Our work used a series of bovine milk concentrates from about 3 to 9% protein with the same casein as a percentage of true protein to determine the amo...

fifty six holstein lactating cows (71 days in milk; 35 kg/day milk production) were employed in a complete block randomized design of repeated measurements. cows were randomly allocated to two treatments based on their parity. cows in group 1 were fed a balanced total mixed ration (600 g concentrate /kg dm and 400 g forages /kg dm) with 50 g rumen protected methionine (rpm) per head per day (me...

Milk production under grazing conditions is carried out in the intertropical region of hot climates due to its low cost. The Tropical Milking criollo breed (LT) characterized by hardiness this region, and high milk quality cheese yield. Grazing supplementation can increase production; however, it also change chemical composition. effect with commercial feed LT cows was evaluated concerning quan...

The objectives of this experiment were to investigate the effects of two ruminally degradable protein (RDP) levels in diets containing similar ruminally undegradable protein (RUP) and metabolizable protein (MP) concentrations on ruminal fermentation, digestibility, and transfer of ruminal ammonia N into milk protein in dairy cows. Four ruminally and duodenally cannulated Holstein cows were allo...