Boletim de Indústria Animal http://www.iz.sp.gov.br/bia/index.php/bia <p align="center"><img src="/bia/public/site/images/fprado/download2.jpg" alt=""></p> <p align="justify"><span style="font-size: medium; font-family: 'book antiqua';">O Boletim de Indústria Animal-BIA é uma revista científica de produção animal e áreas afins, de publicação contínua de acesso livre, on-line, editado pelo Instituto de Zootecnia, da Agência Paulista de Tecnologia dos Agronegócios, Secretaria de Agricultura e Abastecimento do Estado de São Paulo. O BIA tem por objetivo publicar artigos científicos originais em português e inglês, que contribuam para o desenvolvimento da produção animal, nas áreas de Aquicultura, Etologia e Ambiência, Forragicultura e Pastagens, Genética, Melhoramento Animal, Métodos Quantitativos e Economia, Nutrição Animal, Qualidade de Produtos de Origem Animal, Reprodução Animal, Sanidade Animal, e Sistemas de Produção e Agronegócios. Os manuscritos enviados ao Boletim de Indústria Animal devem ser inéditos e não podem ser publicados ou submetidos à publicação em outro meio de divulgação simultaneamente, com exceção de anais de congresso. O BIA publica artigos científicos. O conteúdo dos manuscritos submetidos à publicação no BIA é de responsabilidade exclusiva de seu(s) autor(es)</span><strong style="font-size: medium; font-family: 'book antiqua';"><em>.</em></strong></p> Instituto de Zootecnia pt-BR Boletim de Indústria Animal 1981-4100 <p>Os autores não serão remunerados pela publicação de trabalhos, pois devem abrir mão de seus direitos autorais em favor deste periódico. Por outro lado, os autores ficam autorizados a publicar seus artigos, simultaneamente, em repositórios da instituição de sua origem, desde que citada a fonte da publicação original seja Boletim de Indústria Animal. A revista se reserva o direito de efetuar, nos originais, alterações de ordem normativa, ortográfica e gramatical, com vistas a manter o padrão culto da língua e a credibilidade do veículo. Respeitará, no entanto, o estilo de escrever dos autores. Alterações, correções ou sugestões de ordem conceitual serão encaminhadas aos autores, quando necessário. Nesses casos, os artigos, depois de adequados, deverão ser submetidos a nova apreciação. As opiniões emitidas pelos autores dos artigos são de sua exclusiva responsabilidade. Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob a Licença Creative Commons Attribution (CC-BY-NC). A condição BY implica que os licenciados podem copiar, distribuir, exibir e executar a obra e fazer trabalhos derivados com base em que só se dão o autor ou licenciante os créditos na forma especificada por estes. A cláusula NC significa que os licenciados podem copiar, distribuir, exibir e executar a obra e fazer trabalhos derivados com base apenas para fins não comerciais.</p> Benzocaine and Eugenol as anesthetics for pangasius juveniles, Pangasianodon hypophthalmus http://www.iz.sp.gov.br/bia/index.php/bia/article/view/1765 <p>The aim of this study was to evaluate the effect and efficacy of different concentrations of eugenol and benzocaine for pangasius juveniles (Pangasianodon hypophthalmus) and determine the anesthetic and concentration most appropriate for carrying out routine fish farming practices for this species. One<br>hundred juveniles with an average weight of 32.10 ± 4.9 g and an average total length of 15.32 ± 0.57 cm were used. Four concentrations of both anesthetics were evaluated: 0, 25, 50, 75 and 100 mg/L, with four induction time stages and three recovery stages. During the time that the fish remained anesthetized, biometric procedures were performed. Then, they were transferred to a 10-liter aquarium containing clean water, without adding the anesthetic to observe the recovery time. After recovery, the animals were kept in aquariums for 72 hours to check for mortality. Eugenol, at all concentrations evaluated, and benzocaine, at a concentration of 25 mg/L, were not effective in sedating juveniles of pangasius. Benzocaine concentrations of 75 and 100 mg/L were effective for anesthesia and recovery of fish within the time span of five and<br>seven minutes. However, considering animal welfare, the use of a concentration of 100 mg/L is recommended, as it resulted in shorter latency and recovery times.</p> A. F. Leonardo H. P. Barros G. G. Sampaio ##submission.copyrightStatement## http://creativecommons.org/licenses/by-nc-nd/4.0 2022-03-21 2022-03-21 79 1 10 10.17523/bia.2022.v79.e1505 Hormonal induction and synchronization in the reproduction of nile tilapia (Oreochromis Niloticus) http://www.iz.sp.gov.br/bia/index.php/bia/article/view/1764 <p>The present study aims to evaluate the sexual synchronization of Nile tilapia (Oreochromis Niloticus) breeding herds under different distributions and days. This study was carried out during, a period of 21 experimental days. It was conducted in a randomized block design (DBC), in a factorial scheme 2 × 2 × 3, (male and female, with and without hormone induction, and three times blocks of 7, 14 and 21 days). A total of 324 fish were used, 180 females and 144 males, previously microchipped with approximately 250 ± 12.25 g of body weight.. Each tank contained 36 animals, with every three tanks comprising a block of which were repeated in time. Each of the tanks was composed of only males, another with 12 males and 24 females separated by a glass and a screen on the bottom and the third tank with only females. In each treatment, half of the animals (male and female) were&nbsp; applied the hCG hormone, in a single dose at a concentration of 5 IU / gram fish live weight. The animals were evaluated at 7, 14, and 21 days. After 667 hours-degree after&nbsp; application&nbsp; of the hormone was made extrusion and spermatozoa by celomatic massage. It was observed females that showed ease of extrusion of gametes. For the females, spawning index, absolute and relative fecundity, oocyte weight per 1 g, diameters, and germinal vesicle peripheral position were evaluated; the sperm concentration, volume (ml), motility (%), duration of sperm motility (min) and integrity were evaluated in males. The data were submitted to analysis of variance at the 5% level of significance. For females at 14 days there was greater ease of extrusion when separated from males, with hormone&nbsp; application . The distribution influenced the spawning weight, the larger diameter, and for the diameters smaller the days and induction presented interference. In males, the days interfered in the increase in volume and duration of semen motility independent of induction and environment, and finally, the environment interfered significantly in semen concentration.</p> T. A. R. Tuzine R. T. F. Freitas L. G. Gaya D. A. J. Paula M. S. Tuzine V. O. Felizardo ##submission.copyrightStatement## http://creativecommons.org/licenses/by-nc-nd/4.0 2022-08-16 2022-08-16 79 1 14 10.17523/bia.2022.v79.e1509 Height management strategies of sudangrass ‘BRS estribo’ http://www.iz.sp.gov.br/bia/index.php/bia/article/view/1774 <p>The productive, morphological and chemical composition of Sudangrass ‘BRS Estribo’ submitted to different heights of management was evaluated. The design was in randomized blocks with four replicates in a 3x2 factorial scheme, with three pre-defoliation heights (40, 55 and 70 cm) and two post-defoliation heights (20 and 10 cm). There was no significance between post-defoliation heights for accumulated forage production (AFP), percentages of leaf blades (%F) and of stem and sheath (%S). The AFP at 70 cm pre-defoliation height<br>(10,071.1 kg ha-1) was higher than at 40 cm height (7,471.3 kg ha-1) and did not differ from defoliation at 55 cm (8,562.3 kg ha-1). Predefoliation at 40 cm showed a higher %F (67.67%) than at the heights of 55 cm (61.74%) and 70 cm (55.15%), which differed from each other. The %S was higher for pre-defoliation at 70 cm (35.57%) than at the heights of 55 (32.08%) and 40 cm (27.75%), which also differed from each other. The different handling heights did not change the contents of dry matter, insoluble fiber in neutral detergent,<br>insoluble fiber in acid detergent and ash, which presented averages of 15.87; 60.34; 28.53; and 10.48%, respectively. However, there was a significant interaction between pre-and post-defoliation heights for<br>crude protein (CP) contents, which the management heights at 40 x 20 cm and 70 x 10 cm presented, respectively, the highest (18.78%) and lowest (12.22%) CP contents of the study. Pre-defoliation heights of<br>55 cm with 10 or 20 cm of residual height should be used to improve the botanical composition and crude protein content of Sudangrass BRS Estribo forage.</p> K. G. G. Ferreira B. Q. Almeida L. V. Barros J. L. Ferreira T. G. S. Braz M. H. F. Mourthé ##submission.copyrightStatement## http://creativecommons.org/licenses/by-nc-nd/4.0 2022-06-10 2022-06-10 79 1 14 10.17523/bia.2022.v79.e1506 Nutritional and metabolic parameters of ewe lambs fed yeast in the diet containing fibrolytic enzyme http://www.iz.sp.gov.br/bia/index.php/bia/article/view/1793 <p>This study aimed to evaluate the dry matter digestibility, intake and metabolic profile of ewe lambs fed active or inactive yeasts in the diet containing fibrolytic enzyme. Twenty crossbred animals with an average weight of 33.4kg and an average age of six months were distributed in a completely randomized design. The treatments consisted of yeasts: Control (no yeast), Milk Sacc X<sup>®</sup> (active yeast), Active Flora<sup>®</sup> (active yeast + inactive yeast) and Rumen Yeast<sup>®</sup> (inactive yeast). Analysis of variance and SNK test were applied with a significance level of 5% for type I error. There was no difference for dry matter intake between treatments (P&gt;0.05). There was a significant trend (P=0.0596) for dry matter digestibility, with higher values for the control treatment. There was a significant trend for blood metabolites (P=0.0705), in which the diet containing Milk Sacc<sup>®</sup> was superior to the other treatments for total protein concentration. In addition, there was a statistical difference (P&lt;0.05) for urea concentration, in which control and Active Flora<sup>®</sup> treatments were superior to the others. The inclusion of active or inactive yeasts in the diet for ewe lambs containing fibrolytic enzyme reduces dietary digestibility, without affecting the dry matter intake, in addition, it increases urea and total protein levels without causing liver or kidney damage in ewe lambs.</p> M. T. S. Siqueira A. M. Souza E. B. Schultz K. A. Oliveira L. F. Sousa G. L. Macedo Júnior ##submission.copyrightStatement## http://creativecommons.org/licenses/by-nc-nd/4.0 2022-09-06 2022-09-06 79 1 14 10.17523/bia.2022.v79.e1507