Responses of Ovarian Activity of Dairy Holstein Friesian Heifers after Synchronized Using Heasynch and Select Synch Protocols

Abstract

The objective of this study was to determine the ovarian responses of dairy heifers after treated with estrous synchronization using Heasynch and Select Synch protocols. The study was conducted in Maiwa Breeding Centre (MBC) Farm of Hasanuddin University. A total of 18 dairy Holstein Friesian heifers were used in the present study. The heifers were then divided into two groups based on different treatments of estrous synchronization. All heifers were examined for ovarian activities prior to synchronize the estrus then subjected to either Heasynch or Select Synch protocols. The results of this study showed that inactive ovaries of dairy heifers were relatively higher in comparison to both follicular and luteal phases (58% vs. 26% and 16%). After treating the heifers with either Heatsynch or Selectsynch protocols for synchronizing the estrus, all animals become estrus as predicted in advance. The mean interval from PGF 2 injection to onset of estrus was 42 and 43 h (P>0.05) in Heatsynch and Select-synch protocols, respectively. However, the mean duration of estrus in dairy heifers synchronized using Heatsynch protocol was 25.1 h, significantly higher (P=0.029) than the mean duration of estrus (19.5 h) in Select Synch protocol. It can be concluded that dairy Holstein Friesian heifers synchronized with both the Heatsynch and Select Synch protocols had a good response in synchronizing the estrus regardless of the condition of the ovaries.

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