Advances in Animal and Veterinary Sciences

Research Article
Adv. Anim. Vet. Sci. 8(10): 1079-1086
Http://dx.doi.org/10.17582/journal.aavs/2020/8.10.1079.1086
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Jefferson R. Gandra1*, Tiago A. Dell Vale3, Caio S. Takiya4, Erika R. S. Gandra5, Euclides R. Oliveira2, Rafael H. T. B. Goes2, Isabelle Z. Noia2, Cibeli A. Pedrini2, Giovana S. Urio2, Jamille D. O. Batista2, Giovani Antônio2, Anderson P. Acosta6

1Instituto de Estudo em Desenvolvimento Agrário e Regional. Universidade Federal do Sul e Sudeste do Pará, Marabá PA, Brazil; 2Faculdade de Ciências Agrárias, Universidade Federal da Grande Dourados, Rodovia Dourados-Itahum, Dourados, MS, Brazil 79804-970; 3Faculdade de Agronomia, Universidade Federal do Pampa, campus Itaqui RS, Brazil 97650-000; 4Department of Animal Sciences and Industry, Kansas State University, Manhattan, United States. 66506; 5Instituto de Estudo do Trópico Umido. Universidade Federal do Sul e Sudeste do Pará, Xinguara PA, Brazil; 6Faculdade de Medicina Veterinária. Universidade Estadual de Maringá, Umuarama PR, Brazil.

Abstract | This study aimed to evaluate recombinant bovine somatotropin (rbST) supply on feed intake, performance, serum metabolites, and blood cells count of transition cows. Thirty pregnant Holstein cows (607 ± 28.6 kg of body weight) were randomly allocated to one of the following treatments: 1) Control (CON), without rbST supply; and 2) rbST: 250 mg of slow release rbST (Lactotropin, Elanco Animal Health, USA) supplied every 14 d from 28 d of the expected calving date until 28 d of lactation. rbST group had increased dry matter intake during the post partum period and higher body condition score in both pre- and post-partum periods compared to CON. rbST treatment increased milk yield and milk fat content. Although no effects were observed on serum metabolites before parturition, rbST increased post-partum serum concentrations of glucose, cholesterol, and ionized calcium, and decreased serum concentration of triacyglyceride. rbST had minor effects on complete blood cell count, which included reduced neutrophil counts. In conclusion, this study supports that rbST supply during transition period improves performance of dairy cows that is partially related to improvements in metabolism.

Keywords | leukocyte, milk yield, post-partum, rbST, serum metabolites.