Pregnancy rate of Nelore heifers under artificial insemination combined with mineral and vitamin supplementation
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Abstract
The objective of this study was to evaluate the pregnancy rate of Nelore heifers subjected to artificial insemination combined with mineral and vitamin supplementation. The study was conducted in a rural property in the municipality of Uruará in the state of Pará. Two hundred forty-two Nelore heifers, 24 months old, with an average weight of 320±2.5 kg, were used. Heifers were divided into a control group (n = 121 animals) and a group (n = 121 animals) treated with vitamin and mineral supplementation (Anabolic®), at a dose of 10 mL per animal, by subcutaneous route, at the beginning (D0) of the Fixed-Time Artificial Insemination (FTAI) protocol. Pregnancy diagnosis was made by transvaginal ultrasonography (TVUS). The pregnancy rate of the groups was contrasted by comparison analysis of expected proportion using the chi-square test, with continuity corrections at 5 % significance. Pregnancy rate results were 44,62 % for the control group and 55,38 % for the treated group (p > 2373). However, regarding economic terms, the supplemented cows generated 13 more calves than the control group, with a gross profit of 38,805.60. Vitamin and mineral supplementation administered before FTAI did not promote a significant increase in the pregnancy rate of Nelore cows with moderate body condition score. However, regarding the economic bias, the implementation of the supplementation protocol provided considerable gains to the producer.
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