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This experiment was conducted at the Department of Animal Genetics and Breeding, Sunderasun School of Animal Husbandry and Dairying, Sam Higginbottom Institute of Agriculture, Technology and Science, India. The data were collected from the history sheets record maintained in the Department of Animal Genetics and Breeding, Sunderasun School of Animal Husbandry and Dairying, Sam Higginbottom Institute of Agriculture, Technology and Science, from 1940 to 1970. Animals were managed by skilled
... ed by skilled persons under similar feeding and management condition and the following traits were studied; Gestation length (GL), Birth weight (BW), Lactation Length (LL) and Milk Yield (MY) as influence by age at first service (AFS). The data for the traits of Jersey× Red Sindhi crosses was tabulated and analyzed to determine the relationship between the above mention traits. The GL and LL were measured in days while BW and MY were also measured in kilograms (kg). Completely randomized design and Correlation were used. The animals were grouped into three groups according to AFS G1 (25-28 month), G2 (29-32 month) and G3 (33-36 month). The mean GL in male and female calves ranged from 268 to 348 days and 263 to 405 days respectively. The mean MY of male and female calves ranged from 919.32 kg to 6867.3 kg and 1178 kg to 4573 kg respectively. The LL of male and female calves ranged from 202 to 513 and 213 to 613 days. The mean BW of male and female calves ranged from 11.3 to 28.1 kg and 11.3 to 23.5 kg respectively. It was concluded that there was no significant effect of age at first service on gestation length, lactation length and milk yield (p>0.05), but a significant effect of age at first service was observed on birth weight of females calves born, while male calves birth weight has no effect of age at first service. The gestation length and birth weight were found positively correlated. Therefore, this can give a basis for selection of animals based on their age groups.