author(s)
Vikash Kumar, Rampal Singh, Kaiser Parveen, Raviranjan, Ossmah Kalim, Deepti Kiran Barwa and Aayush Yadav

abstract
Gangatairi breed of cattle is also known as Eastern Haryana or Shahbadi and is a native breed of the tract falling between Ganga and Ghaghara rivers known as Duaba belt that includes four districts of Uttar Pradesh i.e. Varanasi, Ghazipur, Ballia and Chandauli, and five districts of Bihar i.e. Bhabhua, Sasaram, Arrah, Buxer and Chhapra. The present study was conducted on 100 Gangatiri cows (calved during 2003 to 2010) maintained at Livestock cum Agricultural Farm, Arajiline, Varanasi under the Department of Animal Husbandry, Govt. of Uttar Pradesh to study the effect of season and parity on productive and reproductive traits of Gangatiri cows. The productive traits studied were first, second and third lactation total lactation milk yield and lactation length; and first, second lactation dry period. The reproductive parameters studied included age at first calving, first and second calving interval. All the productive and reproductive data was classified into three seasons of calving viz. summer, rainy and winter and into three parity viz. 1-3. The average first, second and third lactation milk yield were 1069.9 Kg, 854.76 Kg, 1029.84 Kg, respectively . First, second and third lactation length was 309 days, 239 days, 249 days respectively. First and second lactation dry period as reported in this study was 170 days and 160 days respectively. In reproductive parameters the average age at first calving, first and second lactation calving interval was reported as 1456 days, 469 days and 398 days respectively. The season of calving was found to have non-significant effect on 1^st, 2^nd and 3^rdlactation milk yield, lactation length and dry period; and first calving interval buthas significant effect on second calving interval. Parity had significant influence on all the production and reproduction traits under study.