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EFFECT OF ENVIRONMENTAL FACTORS ON LACTATION YIELD AND LACTATION LENGTH OF HOLDEO CROSSBRED CATTLE

EFFECT OF ENVIRONMENTAL FACTORS ON LACTATION YIELD AND LACTATION LENGTH OF HOLDEO CROSSBRED CATTLE

Sushilkumar Sanjay Mote, Dineshsingh Satyanarayansingh Chauhan, Dr. Nilotpal Ghosh

Journal Title:
Abstract


The study was undertaken to evaluate the effect of different macro climatic variables on lactation length and lactation milk yield of Holdeo (Holstein Friesian x Deoni) crossbred cattle. Milk data of 145 Holdeo crossbred cows with 619 of lactation records and the meteorological data over a period of 15 years (1995-2003) were obtained from Cattle Cross Breeding Project, Vasantrao Naik Marathwada Krishi Vidyapeeth, Parbhani and University Meteorological Observatory, respectively. It was observed that lactation milk yield and lactation length was highest (1136.56 + 21.04 and 295..29 + 5.51) among the cows calved during winter season as compared to rainy (1073.29 + 79.92, 277.04 + 5.3 ) and summer season (1096.71 + 86.95, 274.53 + 7.29). All the climatic variables considered in the study accounted for 68 %, 56 % and 46 % direct variation on lactation milk yield and 57 %, 53 % and 48 % direct variation on lactation length in rainy, winter and summer season, respectively, as verified by the value of coefficient of determination (R2). This research indicates that crossbred cows were sensitive to seasonal changes on their lactation length and lactation milk yield. High temperature with high humidity had a detrimental effect on lactation yield and lactation length of Holdeo crossbreds. The optimum ranges of temperature; humidity and THI for better performance of crossbred in subtropical region of India were found to be 19-26 oC, 52-66 per cent and 65-68 per cent, respectively. The meteorological observation during the period of study confirmed that there was high value of THI in seven months (March- September) in a year, which suggests that most crossbred cows are exposed to negative effects of heat stress in this region and demanding additional productive strategies like improving environment, management and comfort level of cows for maintaining their lactation performance.

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