Influência da gestação e ordem de lactação nas concentrações séricas de proteínas, metabólitos, minerais e enzimas de vacas da raça Bonsmara

Fernando Cristino Barbosa; Wilson Junior Oliveira; João Gabriel Knychala Faria; Felipe Cesar Gonçalves; Ednaldo Carvalho Guimarães; Antonio Vicente Mundim

doi:10.1590/1809-6891v22e-70943E

Authors

Fernando Cristino Barbosa Universidade Federal de Uberlândia (UFU), Uberlândia, Minas Gerais, Brasil https://orcid.org/0000-0001-9535-0799
Wilson Junior Oliveira Universidade Federal de Uberlândia (UFU), Uberlândia, Minas Gerais, Brasil https://orcid.org/0000-0003-2843-9843
João Gabriel Knychala Faria Universidade Federal de Uberlândia (UFU), Uberlândia, Minas Gerais, Brasil https://orcid.org/0000-0002-0924-0321
Felipe Cesar Gonçalves Universidade Federal de Uberlândia (UFU), Uberlândia, Minas Gerais, Brasil https://orcid.org/0000-0002-4368-9026
Ednaldo Carvalho Guimarães Universidade Federal de Uberlândia (UFU), Uberlândia, Minas Gerais, Brasil https://orcid.org/0000-0001-8328-9687
Antonio Vicente Mundim Universidade Federal de Uberlândia (UFU), Uberlândia, Minas Gerais, Brasil https://orcid.org/0000-0001-9535-0799

DOI:

https://doi.org/10.1590/1809-6891v22e-70943E

Abstract

The aim of this study was to evaluate the influence of pregnancy and lactation order on the serum concentrations of proteins, metabolites, minerals and enzymes of first, second and third lactation order Bonsmara cows. The Bonsmara breed, originated in South Africa, stands out for its tolerance to heat, and productive characteristics, such as meat quality, high fertility, sexual precocity, ease of calving and good maternal ability. These characteristics make the breed a genetic alternative for crossbreeding with zebu breeds. Blood samples were collected from 93 cows, from which 34, 29 and 30 were first, second and third lactation order cows, respectively. Samples were processed in a multichannel automated analyzer using Labtest Diagnostics® kits. To compare the values between lactation orders, the Kruskall-Wallis test was chosen. To compare between pregnant and nonpregnant cows within lactation orders, the Mann-Whitney test was used. Amongst the constituents analyzed, the order of lactation significantly influenced only the serum albumin concentration (ALB) (p<0.0001). Pregnancy significantly influenced the A:G ratio (p=0.034) in third lactation cows; cholesterol (Chol) (p=0.004), triglycerides (TRI) (p<0.0001), inorganic phosphorus (iP) (p=0.033), iron (Fe) (p=0.001), aspartate aminotransferase (AST) (p=0.018) and alkaline phosphatase (ALP) (p=0.039) in second lactation order cows and the value of the overall group. Creatinine (Crea) (p<0.0001) values were influenced by pregnancy only in the overall group. It was concluded that pregnancy and lactation order significantly influenced the concentration of several serum biochemical constituents of Bonsmara cows, especially in second order lactation cows.
Key words: Beef cattle; Phases of production; Serum biochemical; Metabolic profile

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