Sucesso produtivo da indução de estro com prostaglandina em ovelhas da raça Santa Inês: relato de caso

Abstract

The Santa Inês breed is a sheep breed widely used in Brazil, this factor is due to the adaptability and prolificacy of the breed, which on average is 1.4 lambs every two years. One of the techniques being studied are natural estrus inductions associated with the use of pharmacological protocols, including prostaglandin + male effect, which both stimulates follicular growth and also synchronizes estrus in this species. The objective of this course completion work was to report the experience of using prostaglandin in inducing estrus in Santa Inês sheep raised in the Department of Animal Husbandry at the Federal Rural University of Pernambuco - SEDE. We used 28 Santa Inês females raised in a confinement system, fed a diet based on (corn, wheat and soy) 200 g of concentrate/day, Tifton hay, water and mineral salt ad libitum. For estrus synchronization/induction, the animals were arranged in three groups (10, 10 and 8 animals), in order not to overload the breeders. To induce estrus, 0.3 ml of Cloprostenol Sodium (CIOSIN) was administered intramuscularly and repeated after seven days. After 48-72h the females were subjected to natural mating. Pregnancy diagnosis was performed using a trans-rectal ultrasound examination (ALOKA 100), starting on the 35th day after mating. 27 females were able to enter the estrus induction program. From the semiological evaluation, the females were classified according to their body condition score (BCS), where they presented scores between the ranges of 2.5 and 3.5. Regarding the observation of estrus, 100% of the females entered estrus after the second dose of PGF2a, on average 48h after the second application of the hormone. The conception rate showed a percentage of 88,88 % and the fertility rate was 81.48% (22/27). The birth rate was 181.81%, the total number of lambs born was 40 animals (22 males and 18 females), with an average weight of 3.365kg, with a lambing interval of 21 days between the first and last female. submitted to the protocol without transfer. The use of reproductive biotechnology is a viable alternative, as it allows births to be scheduled for a period that meets the needs of researchers from the Department of Animal Science at UFRPE-SEDE. The option to choose the protocol using prostaglandin F2a (PGF2a) was based on practicality and efficiency, as the calving period was reduced and the herd's birth rate increased, meeting our needs.