Evaluation of efficiency of sire model and animal model in Holstein Friesian crossbred cattle considering first lactation production and fertility traits

Abstract

Aim: The present investigation was conducted for evaluating the efficacy of estimating breeding values (BVs) using univariate animal model in comparison to sire model. The various parameters considered for evaluating the efficiency of both linear models were coefficient of determination (R 2 ), coefficient of variation (CV), within sire variance or error variance and spearman's rank correlation estimates. Materials and Methods:Data for the present investigation were spread over a period of 34 years from 1978 to 2012 and consisted of a total of 1988 lactation records of Holstein Friesian crossbred cows sired by 186 crossbred bulls. Results:The percentage of sires having BV (estimated by animal model) more than the average BV for the traits viz. age at first calving (AFC), first service period (FSP), first lactation length (FLL), first calving interval (FCI), first lactation 305 day milk yield (F305MY), first lactation total milk yield (FTMY), milk yield per day of first lactation length (MY/FLL) and milk yield per day of first calving interval (MY/FCI) were 48. 05, 49.39, 55.07, 49.21, 50.00, 51.39, 48.67, 50.39%, respectively. The animal model had higher R 2 , lower CV and error variance for most of the fertility and production traits. The spearman's rank correlation estimates indicated similarity of rankings by both the linear models as the animal model is an improvement of sire model. Conclusion:Animal model had a wider range of BVs indicating the greater differentiating ability of the model. Based on R 2 , CV and error variance animal model was found to be superior in comparison to sire model.

Sire Evaluation Based on First Lactation Production Efficiency Traits in Murrah Buffaloes

“…The estimated breeding value of Persistency averaged as -317.30±12.71 in Murrah buffaloes [7]. Lower ranges for FLMY (553.86) and higher ranges for MY/FLL (1.87) and MY/FCI (2.14) in Holstein Friesian crossbred cattle were reported [8]. The higher range of estimated breeding values of sires by BLUP method for MYLL, MYFCI and MYASC as 5.4 to 7.44, 3.13 to 5.49 and 0.86 to 1.31 in Murrah buffaloes compared to the present study [9].…”

Comparative efficiency of different multiple linear regression prediction equations of first lactation 305-day milk yield for sire evaluation in Murrah buffaloes

“…LSQ (23.22%), BLUP-SM (22.89%) and BLUP-AM (21.35%) indicating that all these methods were almost equally stable. Dash et al (2014) also reported the CV (%) as 24.09 and 22.05 for first lactation 305-day milk yield in Holstein Friesian crossbred cows using sire and animal model, respectively.…”

Assessment of Friesian Cattle Performance Sustainability Through the Evaluation of Phenotypic and Genetic Parameters and Trends of some Economic Traits Under Egyptian Conditions

“…On the other hand, Abou Saq and Ben Naser (2021) obtained a large positive (p<0.0001) PT of + 65.71 kg/ year presenting phenotypic values between 915 and 13845.6 kg/year in Friesian cattle. Also, Dash et al (2016), Konkruea et al (2017) and Vasquez et al (2021) obtained positive trends of +18.71, 21.3 and 294.3 kg/year, respectively, for the milk of Holstein cows and suggested that yield improvement is a result of the applied selection policy emphasizing exclusively the production trait and improvements in management . According to M'hamdi et al (2012), changes in herd size, age of cows, and management practices introduced from one year to another could be responsible for variation in milk production.…”