Comparação dos parâmetros bioquímicos entre gestação única e gemelar de ovelhas da raça Dorper durante gestação, parto e pós-parto

Abstract

RESUMO Nas ovelhas, a demanda de nutrientes aumenta durante a gestação, especialmente nas últimas seis semanas, quando ocorre maior desenvolvimento do feto. Os objetivos deste trabalho foram estudar o perfil bioquímico de ovelhas durante a gestação e no periparto imediato, comparando-se gestação única com gemelar. Foram utilizadas 60 ovelhas, Dorper, divididas em dois grupos experimentais com base no diagnóstico de gestação ultrassonográfico: grupo 1: 30 ovelhas com feto único; grupo 2: 30 ovelhas com gestação gemelar. Em nove momentos de coleta, foram mensurados no soro sanguíneo: ureia, creatinina, proteína total (PT), albumina, globulina, aspartato aminotransferase (AST), gamaglutamiltransferase, fosfatase alcalina, colesterol e triglicérides. O peso vivo das ovelhas do G2 foi maior que do G1 em todos os momentos, inclusive quando estavam vazias. Houve diferença entre as ovelhas do G1 e do G2 nos valores de PT, albumina, AST e triglicérides. A partir de 120 dias de gestação, o perfil proteico se modificou, com menores níveis de ureia, PT, albumina e globulina, mostrando que a demanda metabólica se intensificou no último mês da gestação. Os níveis de colesterol e triglicérides diminuíram de 140 dias de gestação para o parto. Este trabalho mostrou que a gestação proporcionou mudanças significativas no metabolismo da ovelha, principalmente no terço final da gestação, quando há maior necessidade de acompanhamento para evitar a incidência de doenças metabólicas.

Endocrine-metabolic Adaptations in Dorper Ewes: Comparison Between Single and Twin Pregnancies During Gestation, Delivery, and Postpartum

“…The higher BW mean found in the G2 group compared to the G1 group from D0 can be justi ed by higher ovulation and proli cacy rates in the G2 group compared to the G1 group (Santarosa et al 2019a).…”

“…Adhikari et al (2018) found a suppression of glucagon secretion when animals were exposed to high energy diets. In the present experiment, the animals were maintained under the same nutritional diet; however, during pregnancy there was fatty acids mobilisation, with changes in cholesterol and triglycerides levels (Santarosa et al, 2019a), that can generate a negative feedback of glucagon secretion. Glucagon concentration showed large oscillations among sample time points and between groups analysed in the present study, although it did not represent a metabolic change due to pregnancy.…”

“…The ewes included in the present study belonged to the Araí & Zumbi sheep farm, located in Pardinho, São Paulo State, Brazil. A total of 150 non-pregnant healthy Dorper ewes between 2 and 5 years old were submitted to an estrous synchronisation protocol following the methodology described by Santarosa et al (2019a). Laparoscopic xed-time arti cial insemination (FTAI) was performed with frozen semen (D0) of the same breed.…”

“…Water and mineral salt (Ovinophos with Monensina®, Tortuga Agrarian Zootechnical Company, Mairinque, São Paulo, Brazil) were available ad libitum in automatic troughs. Mineral analysis of the total diet (feed, corn silage, and pasture) was undertaken following the methodology described by Santarosa et al (2019a), as well as the sanitary management. At the end of the experimental period, the ewes remained on the farm for lactation with their lambs.…”

Productive and Reproductive Performance of Ewes at 60 and 90 Days Postpartum Treated by Different Weaning System

“…Particularly during this period, it is of utmost importance that feed be supplied in sufficient quantity and quality-as was done in the present study-to minimize weight losses. Weight loss can be influenced by the quality and quantity of available feed, the number of animals fed, environmental factors, and productive potential of the ewe (Campos et al, 2019;Santarosa et al, 2019;Gurgel et al, 2020). The similar performance of the ewes in the different treatment groups indicates that age at weaning is not an influential factor; i.e., they may accompany their lambs for 60 or 90 days (Table 3).…”