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Teruel Investment Funds, Grant/Award Number: FITE 451A and FITE 551A; Spanish Ministry of Science, Innovation and Universities, Grant/Award Number: INIA RTA 2013-00059-C02; Government of Aragon, Grant/Award Number: A14_17R

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Effects of immunocastration performed at two live weights on the growth physiology, temperament and testicular development of feral beef bulls

Publicado en:Animal Science Journal. 91 (1): e13307- - 2020-01-01 91(1), doi: 10.1111/asj.13307

Noya A; Ripoll G; Casasús I; Sanz A;

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Resúmen: The aim of this study was to examine the effect of administering an anti-gonadotropin-releasing hormone vaccine (Improvac (R), developed for pigs) on the performance, temperament, testicular development, and hormone and metabolite profiles of feral bulls (Bos taurus) vaccinated at two different live weights (LW). In all, 16 Serrana de Teruel animals were involved in this 2 x 2 factorial design using the factors LW (LIGHT vs. HEAVY) and vaccine treatment (control, C vs. vaccinated, VA). All animals received the same diet (ad libitum concentrate plus straw) over a 164-day fattening period. Temperament was assessed using chute and flight speed tests. Testicular diameter and subcutaneous fat thickness were recorded. Testosterone, IGF-1, urea, NEFA, and creatinine profiles were analyzed. Bull weight gain was reduced in VA compared to C animals, regardless of the initial LW. The vaccine did not affect the temperament tests, subcutaneous fat thickness or NEFA and creatinine concentrations and had minor effects on linear body measures. The vaccine inhibited testicular growth, reduced plasma testosterone to residual levels, and increased urea concentrations. LIGHT-C animals exhibited increased mean plasma IGF-1 concentrations compared to LIGHT-VA animals. In conclusion, vaccination reduced bull growth and sexual development irrespective of LW at immunization.

Palabras clave: Anti-gonadotropin-releasing hormone (anti-gnrh) vaccine; Behavior; Calves; Carcass traits; Castration; Endocrine; Factor vaccine; Feedlot performance; Igf-1; Male cattle; Meat quality; Steers; Testosterone

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