Data/hora: 24/06/2024 01:05:33

Biblioteca(s): 	Embrapa Gado de Leite.	
Tipo da produção científica: 	Artigo em Periódico Indexado	
Circulação/Nível: 	A - 1	
Data corrente: 	10/08/2021	
Data da última atualização: 	10/08/2021	
Autoria: 	SGUIZZATO, A. L. L.; MARCONDES, M. I.; VALADARES FILHO, S. C.; CATON, J.; NEVILLE, T. L.; MACHADO, F. S.; PACHECO, M. V. C.; ROTTA, P. P.	
Afiliação: 	ANNA L. L. SGUIZZATO, Universidade Federal de Viçosa; MARCOS I. MARCONDES, Universidade Federal de Viçosa; SEBASTIÃO C. VALADARES FILHO, Universidade Federal de Viçosa; JOEL CATON, North Dakota State University; TAMMI L. NEVILLE, North Dakota State University; FERNANDA SAMARINI MACHADO, CNPGL; MARCOS V. C. PACHECO, Universidade Federal de Viçosa; POLYANA P. ROTTA, Universidade Federal de Viçosa.	
Título: 	Body composition changes of crossbred Holstein × Gyr cows and conceptus during pregnancy.	
Ano de publicação: 	2020	
Fonte/Imprenta: 	Journal of Dairy Science, v. 103, n. 3, p. 2773-2783, 2020.	
DOI: 	https://doi.org/10.3168/jds.2019-17490	
Idioma: 	Inglês	
Conteúdo: 	This study aimed to evaluate the effects of plane of nutrition and advancing days of pregnancy (DP) on maternal body composition and fetal development. Differing planes of nutrition were established by 2 feeding regimens (FR): ad libitum (AL) or maintenance (MA). Sixty-two nonlactating multiparous Holstein × Gyr cows with average body weight of 480 ± 10.1 kg and an age of 5 ± 0.5 yr were used. Cows were divided into 3 groups: pregnant (n = 44), nonpregnant (n = 12), and baseline reference cows (n = 6). The 56 pregnant and nonpregnant cows were randomly allocated into 2 different FR: AL or MA. Cows fed at MA received 1.15% of their body weight on a dry matter (DM) basis, receiving corn silage and a concentrate-based diet at a ratio of 93:7 on a DM basis. Reference group cows were slaughtered at the beginning of the experimental period to estimate body composition and empty body weight. To evaluate the effects of DP, pregnant and nonpregnant animals were slaughtered at d 140, 200, 240, and 270 of gestation. Feeding regimen affected maternal tissue composition. Days of pregnancy affected fresh weight (FW), DM, and energy content, but no differences were observed for crude protein (CP) and ether extract (EE) because of DP. Feeding regimen affected mammary gland components (CP, EE, and energy content), but not fresh or dry weights. Days of pregnancy influenced almost all mammary gland components except energy content. Regarding the uterus, FR affected only fresh and dry weights; however, DP affected every uterus component measured. The only interaction between FR and DP in this study was observed for placental FW. Cows fed AL on d 270 presented the same placental FW as cows at MA and AL on d 200 and 240. Further, pregnant cows fed at MA on d 270 had greater placental FW than cows fed AL at this day. Days of pregnancy, but not FR, influenced the composition of fetal fluids in pregnant cows. Finally, cows fed at MA had greater FW for the fetus than cows fed AL; however, fetus composition changed over DP. The FW, DM, EE, and energy content increased until d 270, but CP decreased. In conclusion, the novelty of our data presents how changes due to FR and DP occur in maternal tissues and the conceptus.	
Palavras-Chave: 	Composição corporal; Tecido materno.	
Thesagro: 	Bovino; Gado Gir; Gado Holandês; Reprodução Animal; Útero.	
Categoria do assunto: 	L Ciência Animal e Produtos de Origem Animal	
Registro original: 	Embrapa Gado de Leite (CNPGL)	
Exemplares: 	CNPGL - (25172-1) - UPC - AP - DD -  -  -  - DIS