Advanced SearchSearch Tips
Robustness of Selection Indices in Murrah Buffaloes
facebook(new window)  Pirnt(new window) E-mail(new window) Excel Download
 Title & Authors
Robustness of Selection Indices in Murrah Buffaloes
Gandhi, R.S.; Joshi, B.K.;
  PDF(new window)
Data pertaining to first lactation records of 316 Murrah buffaloes, progeny of 47 sires, maintained at NDRI Farm for a period of 18 years were analysed to construct selection indices and to examine their robustness by changing the relative economic values of different economic traits. A total of 120 selection indices were constructed for three sets of relative economic values ( 40 for each set) considering different combinations of seven first lactation traits viz. age at first calving (AFC), first lactation 305 day or less milk yield (FLMY), first lactation length (FLL), first calving interval (FCI), milk yield per day of first lactation length (MY/FLL), milk yield per day of first calving interval (MY/FCI) and milk yield per day age at second calving (MY/ASC). The three sets of relative economic values were based on economic values of different traits, 1% standard deviation of different traits and regression of different traits on FLMY. The 'optimum' indices for the first two sets had five traits each namely AFC, FLMY, FLL, FCI and MY/ASC giving improvement in aggregate genotype of Rupees 269.11 and Rs. 174.88, respectively. The accuracy of selection from both indices was 70.79 and 69.39%, respectively. The 'best' selection index from the third set of data again had five traits (AFC, FLMY, FLL, FCI and MY/FLL) giving genetic gain of Rs. 124.16 and accuracy of selection of 71.81%. The critcal levels or break-even points for FLMY for varying levels of AFC and FCI estimated from the "optimum index" suggested the need of enhancement of present production level of the herd or reduction of AFC or FCI. It was concluded that economic values of various first lactation traits were the most appropriate to construct selection indices as compared to other criteria of assigning relative economic weights in Murrah buffaloes.
Accuracy of Selection;Aggregate Genotype;Break Even Points;Murrah Buffaloes;Relative Economic Values;Robustness of Selection Indices;
 Cited by
Becker, W. A. 1968. Mannual of Quantitative Genetics. Academic Enterprises, Pullman, Washington DC., USA.

El-Arian, M. N. and V. N. Tripathi. 1990. Selection of Murrah buffaloes for net economic merit. Indian J. Dairy Sci. 43:540-543.

Gajbhiye, P. U. 1987. Evolving restricted indices for selection of buffaloes. Ph. D. Thesis, Kurukshetra University, Kurukshetra.

Gandhi, R. S. and K. Singh. 1999. NDRI Annual Report. p. 6.

Gupta, B. D., R. R. Mishra, S. N. Kaushik and G. S. Bhist. 1991. Selection index in buffaloes-A modified approach. Indian J. Dairy Sci. 44:363-366.

Hazel, L. N. 1943. The genetic basis for constructing selection indices. Genetics 28:476-490.

Joshi, B. K. and V. N.Tripathi. 1986. Evaluation of various measures of overall economic merit as selection criterion in buffaloes. Indian J. Anim. Genet. Breed. 6:12-16.

Karam, H. A., A. B. Chapman and A. L. Pope. 1953. Selection of lambs under farm flock conditions. J. Anim. Sci. 12:148-164.

Kaushik, R and R. S. Khanna. 2003. Efficiency of different selection indices for desired gain in reproduction and production traits in Hariana cattle. Asian-Aust. J. Anim. Sci. 16(6):789-793.

Kulkarni, V. S. 1995. Genetic evaluation in Surti buffaloes. Ph. D. Thesis, Kurukshetra University, Kurukshetra.

Nath, M. and R. C. Sharma. 1997. Construction of selection indices in Murrah buffaloes. Indian J. Anim. Prod. Mngm. 13:199-202.

Patel, A. K. 1992. Evolving selection criteria for the genetic improvement of Surti buffaloes. Ph. D. Thesis, National Dairy Research Institute (Deemed University), Karnal, India.

Singh, B., C. V. Singh and M. C. Yadav. 1988. Selection indices based on reproduction and production traits for Nili-Ravi buffaloes. Asian J. Dairy Res. 7:85-89.