Lactational responses of heat-stressed dairy goats to dietary L-carnitine supplementation
Mehaba, Nabil (Universitat Autònoma de Barcelona)
Salama, Ahmed A. K. (Universitat Autònoma de Barcelona)
Such i Martí, Francesc Xavier (Universitat Autònoma de Barcelona)
Albanell Trullas, Elena (Universitat Autònoma de Barcelona)
Caja López, Gerardo (Universitat Autònoma de Barcelona)

Data:	2019
Resum:	Heat stress causes significant losses in milk production, and nutritional strategies are needed to alleviate its effects. Endogenous carnitine synthesis is also reduced by heat stress (HS). Carnitine plays a central role in fatty acid oxidation and buffers the toxic effects of acyl groups. We hypothesized that carnitine supplementation would make up for any carnitine deficiencies during HS and improve lipid metabolism. The objective was to evaluate rumen-protected L-carnitine (CAR) supplementation in dairy goats under thermo-neutral (TN) or HS conditions. Four Murciano-Granadina dairy goats were used in a four × four Latin square design. Goats were allocated to one of four treatments in a two × two factorial arrangement. Factors were 1) diet: control (CON) or supplementation with CAR (1 g/d); and 2) ambient conditions: TN (15 to 20 °C) or HS (0900 to 2100 h at 35 °C, 2100 to 0900 h at 28 °C). Blood free-, acetyl-, and total-carnitine concentrations increased almost three times by supplementation. Despite this efficient absorption, CAR had no effect on feed intake, milk production or blood metabolites in TN or HS conditions. Heat stress increased rectal temperature and respiratory rate. Additionally, HS goats experienced 26% loss in feed intake, but they tended to eat longer particle sizes. Compared to TN, heat-stressed goats lost more subcutaneous fat (difference in fat thickness measured before and after each period = −0. 72 vs. +0. 64 mm). In conclusion, supplemented L-carnitine was efficiently absorbed, but it had no lactational effects on performance of goats under thermo-neutral or heat stress conditions.
Ajuts:	Ministerio de Economía y Competitividad AGL2013-44061-R
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	L-carnitine ; Heat stress ; Feed sorting ; Metabolism ; Dairy goats
Publicat a:	Animals, Vol. 9 Núm. 8 (august 2019) , p. 567, ISSN 2076-2615

DOI: 10.3390/ani9080567
PMID: 31426431

12 p, 346.2 KB

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