Open AccessEfficiency of the anti-GnRH vaccine for castration of lambs intended for finishing in pastures
Author(s) -
Mariana de Nadai Bonin,
Camila Celeste Brandão Ferreira Ítavo,
Luís Carlos Vinhas Ítavo,
Marina de Nadai Bonin Gomes,
Breno Fernandes Barreto Sampaio,
Gelson dos Santos Difante,
Antônio Leandro Chaves Gurgel,
Thais Fernanda Farias de Souza Arco,
Kedma Leonora Silva Monteiro Ferelli,
Lucy Mery Antonia Surita
Publication year - 2021
Publication title -
semina. ciências agrárias
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.268
H-Index - 25
eISSN - 1679-0359
pISSN - 1676-546X
DOI - 10.5433/1679-0359.2021v42n5p2839
Subject(s) - zoology , weight gain , medicine , semen , saline , biology , andrology , endocrinology , body weight
It was aimed to evaluate anti-GnRH vaccine efficiency on productive characteristics, seminal performance, size, and histology of testicles of lambs submitted to immunocastration. Twenty contemporary Texel lambs were evaluated, being 10 animals received two doses of 1 mL of anti-GnRH vaccine and 10 received two doses of 1 mL of saline, with an interval of 30 days. Seminal characteristics, weight and histological cut for the testicles, productive performance, and blood parameters were analyzed. Andrological monitoring was carried out every 30 days. All animals were kept on pasture of Urochloa spp. receiving daily supplementation protein-energetic by 90 days. There was effect of immunocastration on slaughter weight (44.3 vs. 48.3 kg), total gain (9.9 vs. 10.3 kg), daily gain (104.5 vs. 108.9 g/day), and feed conversion (5.83 vs. 5.97) respectively to immunocastrated and intact lambs. There was immunocastration effect on testicle weight (0.09 vs. 0.35 g), motility (4.5 vs. 61.0%), vigor (0.40 vs. 3.00), volume (0.09 vs. 0.74 mL) and swirling (0.20 vs. 2.70) in the third semen collection. Immunocastration through two doses of 1 mL of anti-GnRH vaccine with a 30-day interval between doses, causes infertility in sheep and can be adopted for lambs.