RANDOM REGRESSION MODEL AND BLUPF90 ANALYSES TO EVALUATE THE GENETIC AND PHENOTYPIC TRENDS FOR LACTATION AND REPRODUCTIVE TRAITS IN THE EGYPTIAN BUFFALO

Document Type : Original Article

Authors

1 Department of Animal Production, Faculty of Agriculture, Benha University, Egypt

2 Animal Production Research Institute (APRI), Agricultural Research Center (ARC), Dokki, Giza 12618, Egypt

Abstract

The aims of this study were to estimate the variance components and heritability estimates for some lactation and reproduction traits of Egyptian buffaloes using a repeatability animal model and Random Regression Model (RRM) and plot the genetic and phenotypic trends. A total number of 7345 test-day records (TD) of milk yield (TDMY), fat yield (TDFY), protein yield (TDPY) and somatic cell score (TDSCS) were gathered monthly from 686 buffaloes. Also, a total number of 7279 reproduction records were collected from 1951 buffaloes. All herds belong to the Animal Production Research Institute (APRI), Ministry of Agriculture and Land Reclamation (MALR), Egypt. The genetic trends for lactation traits favorably increased from -4.63 kg to be 1.61 kg for TDMY, -5.0 g to be 495 g for TDFY and -26 g to be 280 g for TDPY, associated with favorably decreasing trend from 1.19 to be 1.37 for TDSCS as year of TD of milk advanced. On the contrary, the phenotypic trends decreased from 7.49 to 5.69 kg for TDMY, 510 to 360 g for TDFY and 284 to 223 g for TDPY, while that of TDSCS increased to be from 1.62 to 2.43. The genetic trends for reproduction traits slightly decreased from 0.24 mo to be -0.14 mo for AFC, 5.5 d to be 2.9 d for DO and 6.9 d to be 3.6 d for CI, while the phenotypic trends favorably decreased from 36.57 to 36.52 mo for AFC, 127 to 71 d for DO and 416 to 354 d for CI.

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