Estimation of Genetic and Non-Genetic Parameters for Reproduction and Production Traits of Holstein Friesian Dairy Herd at ELFORA Cheffa Dairy Farm, Oromia Zone of Amhara Region, Ethiopia

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Abstract:

The study was conducted at Cheffa dairy farm with the objective of estimating the effects of genetic and non-genetic factors on Age at First Service (AFS), Age at First Calving (AFC), Calving Interval (CI), Days Open (DO), Number of Service per Conception (NSC), Lactation Length (LL) and adjusted 305 days milk yield (305-dMY). A total of 2343 records were collected from 123 cows and 13 sires' progenies having greater than 93.75 % HF blood levels through the period from 1996 to 2014 for evaluation. Independent variables were year of birth and season, year of calving and season and parity while AFS, AFC, CI, DO, NSC, LL and 305-dMY were taken as dependent variables. Data were analyzed using the General Linear Models (GLM) of SAS, 2008 and using PEST and VCE software for genetic parameter estimation. The results indicated that the overall least squares means (± standard error) of AFS, AFC, CI, DO, NSC, LL and 305-dMY were 30.5 ± 0.60 months, 39.76 ± 0.67 months, 446.1 ± 6.79 days, 181.7 ± 7.01 days, 1.6 ± 0.05, 328.3 ± 5.50 days and 2305.2 ± 32.15 liters, respectively. Year of birth had highly significant (p

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Estimation of Genetic and Non-Genetic Parameters for Reproduction and Production Traits of Holstein Friesian Dairy Herd at ELFORA Cheffa Dairy Farm, Oromia Zone of Amhara Region, Ethiopia

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