Improvement Postpartum Reproductive Efficiency of Crossbred Native x Holstein Dairy Cows through Active Immunization against Testosterone

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Petai Pongpiachan
Udom Changsuphan
Puntipa Pongpiachan
Chatree Tong-Inn

Abstract

The objective of this study was to immunize crossbred dairy cows from small holder village farms against Testosterone to improve efficiency of postpartum reproduction. Immunogen was Testosterone-3-(O-Carboxymethyl)Oxime-Human Serum Albumin (T4-HSA). Experimental animals were from village farms in Mae Rim, Sun Sai and Sun Kumpaeng district of Chiang Mai province and Ban-Ti district of Lumphun province. Most cows were slow to conceive after artificial insemination. Experimental design was Completely Randomized Design (CRD) with regiment: control and actively immunized against Testosterone (Anti-T4). The cows were immunized two times with 1 month apart. Milk samples were collected twice weekly and terminated until 135 days postimmunization. Body condition score (BCS) between 1 to 5 were also recorded at the time of immunization. The results of this study were that : cows from within control and Anti-T4 had area under postpartum progesterone concentration 6.2±1.3 and 8.2±1.1 units; body condition score 3.3±0.1 and 2.9±0.1 (P<.05); pregnancy rate 63.6 and 77.8% (P<.05), respectively. These study demonstrated that immunization against Testosterone can be use for improvement reproductive efficiency of dairy cows under farm condition, especially with slow to conceive cows in small holder village farms.

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References

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