RESUMO
This study aimed to compare the postpartum uterine dynamics of primiparous precocious (PP), primiparous conventional (PC) and multiparous conventional (MC) Bos indicus beef cows. For this purpose, PP (n = 8), PC (n = 18) and MC (n = 12) cows were enrolled in this study. These cows were evaluated at 20 and 10 days prepartum and weekly from parturition to 42 days postpartum (DPP). During this period, body weight (BW), subcutaneous fat thickness (SFT) and serum concentrations of glucose, ß-hydroxybutyrate, albumin and haptoglobin were measured. Proportion of polymorphonuclear (PMN) cells, and abundance of mRNA transcripts of genes involved in uterine inflammation and uterine health were evaluated. The PP cows had lower (p < .05) BW and SFT than that for PC and MC cows during the study period. The serum concentration of albumin after 35 DPP was lower (p < .05) in PP cows. The PP cows had the highest proportion of PMN on 28 and 35 DPP compared to PC and MC cows. The relative mRNA abundance of IL-1ß and IL-8 increased after 21 DPP in PP cows compared to the other groups. The PC had the highest, MC had an intermediate, and PP cows had the lowest relative abundance of IL10 mRNA. Overall, these findings indicated that uterine inflammation was more pronounced in PP cows. Moreover, based on the proportion of PMN and abundance of transcripts associated with inflammation in the uterus, PP cows may require a longer period to recover their uterine health after calving.
Assuntos
Doenças dos Bovinos , Doenças Uterinas , Gravidez , Feminino , Bovinos , Animais , Lactação , Período Pós-Parto , Doenças Uterinas/veterinária , Inflamação/veterinária , Peso Corporal , RNA Mensageiro , Albuminas , LeiteRESUMO
ABSTRACT This study aimed to evaluate the efficiency of a body condition score (BCS) assessment device (BCAD) to identify cows with an adequate BCS and, presumably, a higher fertility when subjected to timed artificial insemination (TAI). We evaluated cows at smallholder dairy farms in the state of Rondonia, Brazil. Crossbred dairy cows (n = 141) were subjected to a TAI protocol and classified according to the BCAD scale as low BCS (red; n = 55) or adequate BCS (green; n = 86). The outcome pregnancy per artificial insemination (P/AI) was analyzed by logistic regression. Cows classified as green by the BCAD had a significantly greater P/AI (41 of 86; 47.7%) than cows classified as red (15 of 55; 27.3%; P = 0.01). In conclusion, the BCS assessment device was an effective tool to detect cows more likely to become pregnant due to their adequate BCS and, consequently, better fertility in TAI.
RESUMO Este estudo investigou a eficiência de um dispositivo avaliador de ECC (escore de condição corporal) (DAEC) para identificar vacas com ECC adequado e, presumivelmente, com fertilidade mais alta quando submetidas a protocolos de inseminação artificial em tempo-fixo (IATF). Conduzimos o estudo em pequenas propriedades leiteiras no estado de Rondônia, Brasil. Vacas leiteiras mestiças (n = 141) foram submetidas a um protocolo de IATF e classificadas de acordo com a escala do DAEC em vacas com ECC baixo (vermelho; n = 55) ou ECC adequado (verde; n = 86). A prenhez por inseminação artificial (P/IA) foi analisada por regressão logística. Vacas classificadas como verde no DAEC apresentaram P/IA significativamente mais alto (41 de 86; 47,7%) que vacas classificadas como vermelho (15 de 55; 27,3%; P = 0,01). Conclui-se que o dispositivo avaliador de ECC é uma ferramenta eficiente para detectar vacas com adequado ECC e com consequente maior fertilidade na IATF.