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Rajasthan University of Veterinary and Animal Sciences, Bikaner (2016)

PERFORMANCE OF RATHI CATTLE UNDER ORGANIZED FARM MANAGEMENT CONDITIONS

CHHOTE SINGH DHAKA

Titre : PERFORMANCE OF RATHI CATTLE UNDER ORGANIZED FARM MANAGEMENT CONDITIONS

Auteur : CHHOTE SINGH DHAKA

Université de soutenance : Rajasthan University of Veterinary and Animal Sciences, Bikaner

Grade : Doctor of Philosophy (PhD) (Livestock Production Management) 2013

Résumé partiel
The present investigation was conducted on the performance records of 524 lactations of Rathi cows maintained at Livestock Research Station, Department of Animal Breeding and Genetics, College of Veterinary and Animal Science, Bikaner and 892 lactations of Rathi cows maintained at Livestock Research Station, Nohar, District Hanumangarh. To take account for genrtic as wel as environmental trends.The whole data were grouped into four periods according to date of calving as P1(1977-1985), P2 1986-1994), P3 (1995-2003 ) and P4 (2004-2011).To study the effect of season of calving on other production and reproduction traits, each year was divided into three seasons according to the climatic conditions The three seasons were summer S1 (March to June), monsoon S2 (July to October) and winter S3 (November to February). The overall standard lactation milk yield (SLMY) was observed to be 1726.08 S±112.621 litres. The effect of period of calving on lactation yield was found to be highly significant (P≤0.01). Fourth period is having highest SLMY (1851.97 ± 26.728 litres). The SLMY was highly significantly (P≤0.01) influenced by parity. The effect of farm on SLMY was found to be non-significant. The highest SLMY was recorded at Bikaner farm as 1739.69 ± 19.202 litres while lowest yield at Nohar farm was 1712.48 ± 16.087 litres. The overall least-squares mean of peak yield was estimated as 9.02 ± 0.066 litres. The effect of period of calving was found to be statistically highly significant (P≤0.01). The mean of lactation length was estimated to be 275.49 ± 4.655 days. The effect of period of calving was observed to be significant on lactation length. The effect of season of calving on lactation length was found to be highly significant (P≤ 0.01). The effect of parity on lactation length was found to be highly significant (P≤ 0.01). The dry period of Rathi cows was observed to be 154.46 ± 5.530 days in the present investigation. There was nonsignificant difference in dry periods due to parity. The overall least-squares mean of days to attain peak yield was estimated as 30.95 ± 0.036 days. The effect of period of calving on days to attain peak yield was found to be statistically highlysignificant (P≤0.01). Effect of parity was observed to be highly significant (P≤0.01), The overall milk yield per day of lactation length was estimated as 5.92 ± 0.038 litres. The persistency index of Rathi cows was observed to be 196.29 ± 1.296 in the present investigation.

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