Lakshmikantan, UVadivoo, VSMathivanan, RTANUVAS2020-02-282020-02-282019-12http://krishikosh.egranth.ac.in/handle/1/5810143948TNV_35thVCRI_CA_Dec-2019_RBTO-3Effect of ‘ProSync – NF’ dermal patch in estrus induction among anestrus cattle was studied. Pluriparous cows (n = 7) with the signs of post-partum anestrus were selected for the study. On rectal examination, one animal was not having corpus luteum in both the ovaries (true anestrum) while the other six animals had corpus luteum (false anestrum). All the seven animals were affixed with the ‘ProSync – NF’ dermal patch (coated with nano progesterone) for five days. Except for the case of true anestrum, all the other animals were administered with Cloprostenol sodium (250μg) on the day of patch removal (Day 5). Six (85.0%) out of seven animals (including the cow with ovarian inactivity) evinced estrus after the treatment. Out of six, four (66.0%) and two (44.0%) animals showed estrus 72 hours and 120 hours after patch removal, respectively. All the six animals were inseminated with frozen semen. All the animals were subjected for pregnancy verification by 60 days post-insemination by rectal examination and it was found that four (66.0%) out of six animals were pregnant. Out of the seven animals treated with ‘ProSync – NF’ dermal patch, four cows (57.0%) conceived which is indicative of fertile estrus induction at the first service. Hence it could be concluded that ‘ProSync – NF’ dermal patch could be effectively used to induce the estrus in anestrus cows.enVeterinary ScienceOther