Fecha/hora: 01/06/2024 23:53:05

Biblioteca(s): 	INIA La Estanzuela.	
Fecha corriente: 	23/07/2020	
Fecha de la última actualización: 	23/07/2020	
Autoria: 	TALMÓN, D.; GARCIA-ROCHE, M; MENDOZA, A.; MATTIAUDA, D.A.; CARRIQUIRY, M	
Afiliación: 	DANIEL TALMÓN, Daniel Talmón Departamento de Producción Animal y Pasturas, Facultad de Agronomía, Universidad de la República, 12900 Montevideo, Uruguay; MERCEDES GARCIA-ROCHE, Departamento de Producción Animal y Pasturas, Facultad de Agronomía, Universidad de la República, 12900 Montevideo, Uruguay.; ALEJANDRO FRANCISCO MENDOZA AGUIAR, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; DIEGO A MATTIAUDA, Departamento de Producción Animal y Pasturas, Facultad de Agronomía, Universidad de la República, 12900 Montevideo, Uruguay; MARIANA CARRIQUIRY, Departamento de Producción Animal y Pasturas, Facultad de Agronomía, Universidad de la República, 12900 Montevideo, Uruguay.	
Título: 	Energy partitioning and energy efficiency of two Holstein genotypes under a mixed pasture-based system during mid and late lactation.	
Año de publicación: 	2020	
Fuente/Imprenta: 	Livestock Science, September 2020, Volume 239, Article 104166. Doi: https://doi.org/10.1016/j.livsci.2020.104166	
DOI: 	10.1016/j.livsci.2020.104166	
Idioma: 	Inglés	
Notas: 	Article history: Received 28 February 2020; Received in revised form 9 July 2020; Accepted 9 July 2020. Corresponding author:
E-mail address: danieltalmon94@gmail.com (D. Talmón).	
Contenido: 	Abstract:
The objective was to evaluate the effect of the Holstein genotype (North American Holstein vs. New Zealand Holstein; NAH vs. NZH, respectively) in a pasture-based system on heat production (HP), energy partitioning between maintenance and production (milk and tissue) and energy efficiency during two different stages of lactation. Twenty-eight Holstein dairy cows (14 cows of each genotype) with similar calving date (May 5, 2018 ± 23 days) were managed in a pasture-based system and supplemented with one third of the predicted total dry matter intake as concentrate. Heat production, retained energy in milk and tissue, metabolizable energy intake (MEI) and the proportion of MEI retained in milk + tissue (RE/MEI) were measured at 115 and 192 ± 19 days in milk and residual HP was estimated by the difference between measured HP and predicted HP based on NRC (2001) model according to body weight, body condition score and milk production. The NAH cows were 60 ± 15 kg heavier and produced 4.7 ± 1.0 kg/d more milk with lower percentages of fat and protein than NZH cows. However, there were no differences in fat or protein yield per day between genotypes. Metabolizable energy intake, retained energy in milk and tissue, HP and RE/MEI were not different between genotypes at 115 days in milk. Nevertheless, at 192 days in milk the MEI, HP and residual HP were lower in NZH than NAH, whereas RE/MEI was not different when both genotypes were managed under a pasture-based system with one third of the consumed diet as concentrate. The capacity of NZH cows to maintain the same RE/MEI than NAH cows at 192 days in milk despite of the lower MEI, was due to a lower metabolizable energy requirement for maintenance (853 vs. 729 kJ/body weight0.75 per day for NAH and NZH, respectively). Indeed, the lower energy requirement for maintenance in NZH was associated with a lower fasting heat production since kl were not different between genotypes. Thus, NZH cows could have a lower proportion of their body as protein mass or a lower relative mass of the internal organs involved with digestive and circulatory functions. However, further investigation is necessary to understand the differences in maintenance energy requirements between the Holstein genotypes.	
Palabras-Clave: 	CALORIMETRÍA INDIRECTA; DAIRY CATTLE; ENERGY EXPENDTURE; GASTO DE ENERGÍA; GRAZING SYSTEM; HOLSTEIN-FRIESIAN; INDIRECT CALORIMETRY; SISTEMA DE PASTOREO.	
Thesagro: 	VACAS LECHERAS.	
Categoría del tema: 	--	
Registro original: 	INIA La Estanzuela (LE)	
Ejemplares: 	LE - (103153-1) - PXI - AP - DD - PP/Livestock Science/2020 -  -  - DIS