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Indian Journal of Animal Research, volume 37 issue 1 (january to june 2003) : 19 - 23

TOTAL DETERMINATION OF CALVING INTERVAL BY PATH ANALYSIS IN MURRAH BUFFALOES

S. Banik, 5.5. Tomar

Affiliations

¹Dairy Cattle Breeding Division, National Dairy Research Institute, Karnal- 132 001, India

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Cite article:- Banik S., Tomar 5.5. (2024). TOTAL DETERMINATION OF CALVING INTERVAL BY PATH ANALYSIS IN MURRAH BUFFALOES. Indian Journal of Animal Research. 37(1): 19 - 23. doi: .

ABSTRACT

Based on 1277 observations of Murrah buffaloes, the calving interval was found to be 454.8±5.8 days with service period of 145.3±5.8 days, gestation period of 309.5±0.3 days, lactation length of 285.8±2.2 days and dry period of 143.6±5.1 days based on all lactations. The path analysis of calving interval by taking reproductive components showed that maximum variability in calving interval was due to service period (99.26%), whereas the effect of gestation period was very small. For considering different lactations, it was observed that the service period explained 99.18 to 99.70 per cent variation in calving interval. The total effect of service period was due to its direct effect. The gestation period explained 0.31 to 0.81 per cent variation in different lactations. By taking the effects of productive components on calving interval, it was shown that the effect of dry period was more than the lactation length. The total effects of dry period and lactation length were 69.8 per cent and 49.0 per cent, respectively, considering all lactations. Maximum of the total effects was due to the direct effects of these characters. In both the cases of reproductive and productive traits, the model explained the total variation in calving interval.

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REFERENCES

Singh, R.K. and Chaudhury, B.D. (1977). Blometrical Methods in Quantitative Genetic Analysis. Kalyani Publishers, New Delhi and Ludhiana. '
Snedecor, G.W. and Cochran, W.G. (1967). Statistical Methods. Oxford and IBH Publication Co. Calcutta, Bombay, New Delhi.
Tomar, 5.5. (2000). In: Compendium of Lectures. National Training Programme on Applied Statistical Methodology with Comput~r Orientation In Animai Breeding, February 10 to March I, (2000). Dairy Cattle Breeding Division, NOR!, Kamal, India.
Wright, S. (1921). J. Agric. Res., 20: 357·385.

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