Abstract The scientific article presents the results of experiment on study qualitative indicators beef obtained from crossbreeding cattle breeds in conditions Volgograd agricultural enterprise JSC “Berdievsky elevator”. Obtained crossbred steers at age 9 months were divided into 4 groups: I experimental - ½ a cross (Hereford х Russian Komolaya), II (Kazakh Whitehead Kalmykian), III (Kalmykian ...

Linkage disequilibrium (LD) and the persistence of its phase across populations are important for genomic selection as well as fine scale mapping of quantitative trait loci (QTL). However, knowledge of LD in beef cattle, as well as the persistence of LD phase between crossbreds (C) and purebreds, is limited. The objective of this study was to understand the patterns of LD in Angus (AN), Charola...

An all-breed animal model was developed for routine genetic evaluations of US dairy cattle. Data sets from individual breeds were combined, and records from crossbred cows were included. About 1% of recent cows were first-generation crossbreds. The numbers of cows with records since 1960 ranged from 10 to 22 million for the 6 traits analyzed, which were milk, fat, protein, somatic cell score, p...

Aim: A sporadic incident of Clostridial disease that affected Holstein Friesian (HF) cross bred cows (n=8) at an organized dairy farm was investigated. Materials and Methods: Detailed clinical investigations and treatment were carried out on all the affected animals. Complete blood count (CBC) and plasma biochemistry were performed on survived animals (n=6). The needle biopsy samples were subje...

One thousand and ninety-four crossbred Zebu cattle were immunized against heartwater with a sheep-blood vaccine containing the Ball 3 strain of Cowdria ruminantium. Animals experiencing febrile reactions were treated at various stages of the reaction with tetracycline. Four hundred and sixty-two (42.2%) reacted, six (0.6%) of which died. Deaths were significantly less frequent in cattle treated...

Nine measures related to breeding efficiency were used for comparisons among purebred Ayrshires, Brown Swiss, Holsteins, and Jerseys and between purebreds and 32 crossbred groups representing 2-breed, 3-breed, 5/8, and backcrosses by purebred sires and progeny of crossbred sires. There were four herds wi th Holsteins common to all, Brown Swiss and Jerseys in three herds and Ayrshires in one her...