Data/hora: 21/09/2024 21:41:01

Biblioteca(s): 	Embrapa Gado de Leite.	
Data corrente: 	20/05/2024	
Data da última atualização: 	26/06/2024	
Autoria: 	RIBEIRO, R. S.; SILVA, A. S.; DIAVÃO, J.; SACRAMENTO, J. P.; MINIGHIN, D.; TOMICH, T. R.; MACHADO, F. S.; CAMPOS, M. M.; PEREIRA, L. G. R.; MAURÍCIO, R. M.; CHAVES, A. V.	
Afiliação: 	RAFAEL SANDIN RIBEIRO, UNIVERSIDADE FEDERAL DE SAO JOAO DEL-REI; ABIAS SANTOS SILVA; JACIARA DIAVÃO; JOÃO PAULO SACRAMENTO, UNIVERSIDADE FEDERAL DE SÃO JOÃO DEL-REI; DUARTE MINIGHIN, UNIVERSIDADE FEDERAL DE SÃO JOÃO DEL-REI; THIERRY RIBEIRO TOMICH, CNPGL; FERNANDA SAMARINI MACHADO, CNPGL; MARIANA MAGALHAES CAMPOS, CNPGL; LUIZ GUSTAVO RIBEIRO PEREIRA, CNPGL; ROGÉRIO MARTINS MAURÍCIO, UNIVERSIDADE FEDERAL DE SÃO JOÃO DEL-REI; ALEXANDRE VIEIRA CHAVES, UNIVERSITY OF SYDNEY.	
Título: 	Ration particle size has different effects on digestive but not production parameters in higher-yielding (Holstein) compared to lower-yielding (Girolando) cows.	
Ano de publicação: 	2024	
Fonte/Imprenta: 	Journal of Dairy Research, v. 91, n. 1, p. 25-30, 2024.	
DOI: 	https://doi.org/10.1017/S0022029924000207	
Idioma: 	Inglês	
Conteúdo: 	The aim of the study was to evaluate the effect of total mixed ration particle size (length) and breed of cow on intake dynamics, animal performance and CH4 emissions, comparing high yielding Holstein and low yielding Girolando cows. The experimental design was 2 × 2 Latin Square arranged as a crossover factorial scheme with two diets (short particle size, SPS and long particle size, LPS) and the two breed compositions. The design comprised two periods of 26 d each, where all data collection was performed at cow level. No influence of the particle size occurred for the passage rate, neutral detergent fiber digestibility, performance and milk composition, methane emissions or ruminal fermentation parameters. Girolando cows had greater dry matter intake (DMI) when fed SPS, while Holsteins had the same (P < 0.05). Girolando cows had lower dry matter digestibility when fed LPS compared to SPS, while Holsteins had the opposite effect (P < 0.05). Also, the digestibility of crude protein and non-fibrous carbohydrates decreased in Girolando cows fed LPS, but not in Holsteins (P < 0.05). Girolando cows reduced DMI by 10.6% when fed LPS diet (P < 0.05). Girolando had an increased eating rate (+24 g of DM/min; P < 0.05) compared to Holstein cows, but Holstein cows had a lower CH4 intensity (by 29.7%: P < 0.05). Girolando cows increased the dry matter intake when fed a diet with short particle size, while the same did not happen in Holsteins. Dry matter digestibility increased in Holsteins when fed long particle size, while the opposite was observed in Girolando cows. Nutrient digestibility was reduced in Girolando cows when fed short particle size. Particle size did not influence eating time, eating rate, feed trough visits, visits with intake, milk yield and composition regardless of the breed. Reducing particle size increased CH4 intensity in both breeds.	
Palavras-Chave: 	Comportamento de classificação; Intensidade de CH4; Taxa de passagem.	
Thesagro: 	Bovino; Fermentação; Rúmen.	
Categoria do assunto: 	L Ciência Animal e Produtos de Origem Animal	
Registro original: 	Embrapa Gado de Leite (CNPGL)	
Exemplares: 	CNPGL - (26363-1) - UPC - AP - DD -  -  -  - DIS