the study was carried out at agarfa atvet college dairy farm to evaluate the reproductive performance of holstein friesian× arsi and holstein friesian ×boran cattle. for the study, records compiled from 1983 to 2012 at the agarfa dairy farm were used as original data. the effects of breed, bloodlines, season and parity on the reproductive traits were evaluated. data were analyzed using the gene...

ABSTARCT The objective of this study was to analyze the effects of factors affecting reproductive traits in the Holstein population of the Isfahan dairy farms for subsequent compilation of the model for genetic evaluation as well as for herd management practice. A data set containing 99012 records were analyzed by a linear model with fixed effects of year , herd ,season, parity of dam, calving ...

The data on age at first calving for 539 records of crossbred cows differentfilial/genetic groups were considered the present investigation. These crossbreds belonged to eightfilial/genetic (F1, F2, F3, F4, F5, F6, F7 and F8) maintained Livestock Experiment StationQadirabad District Sahiwal from 1991 2014 (24 years). duration 24 year was divided into 6periods (P1, P2, P3, P4, P5 P6) four years ...

Submit Manuscript | http://medcraveonline.com Abbreviations: AAU: Addis Ababa University; AFC: Age at First Calving; AFS: Age at First Service; CFT: Complement Fixation Test; CI: Calving Interval; CVMA: College of Veterinary Medicine and Agriculture; NSC: Number of Services per Conception; PGF2α: Prostaglandin F2 Alpha; PPA: Post-Partum Anoestrus; RBPT: Rose Bengal Plate Test; RP: Retained Plac...

The objective of the present study was to estimate genetic trends for lactation milk yield, persistency of milk yield, somatic cell count and interval between first and second calving in Holstein dairy cows of Iran. The dataset consisted of 210,625 test day and 25,883 first parity cows with milk yield recorded from July 2002 to September 2007 comprising 97 herds in Iran. Breeding values of anim...

the objective of the present study was to estimate genetic trends for lactation milk yield, persistency of milk yield, somatic cell count and interval between first and second calving in holstein dairy cows of iran. the dataset consisted of 210,625 test day and 25,883 first parity cows with milk yield recorded from july 2002 to september 2007 comprising 97 herds in iran. breeding values of anim...

The objective of this study was to estimates the genetic and environmental components for the lactation curve parameters, milk yield, age at first calving (AFC), calving interval (CI) and somatic cell count (SCC) in Iranian Holstein cows. The dataset consisted of 210625 test day records from 25883 cows with milk yield in the first parity recorded from July 2002 to September 2007 in a total of 9...