Parity and grazing-time effects on milk fatty acid profile in dairy cows
E. Morales-Almaráz A B , B. de la Roza-Delgado A , A. Soldado A , A. Martínez-Fernández A , A. González A C , I. A. Domínguez-Vara B and Fernando Vicente A D
+ Author Affiliations
- Author Affiliations
A Servicio Regional de Investigación y Desarrollo Agroalimentario (SERIDA), Carretera de Oviedo s/n, 33300 Villaviciosa (Asturias), Spain.
B Facultad de Medicina Veterinaria y Zootecnia, Universidad Autónoma del Estado de México (UAEM), Instituto Literario Ote 100 Colonia Centro, 50000 Toluca, Mexico.
C Present address: Fundación CETEMAS, Pumarabule, Carbayín s/n, 33936 Siero (Asturias), Spain.
D Corresponding author. Email: fvicente@serida.org
Animal Production Science 58(7) 1233-1238 https://doi.org/10.1071/AN15755
Submitted: 28 October 2015 Accepted: 22 November 2016 Published: 30 January 2017
Abstract
Milk fatty acid (FA) profiles of lactating Holstein dairy cows were determined to evaluate the effects of parity (primiparous or multiparous) and the grazing time (0, 6 and 12 h), complementary to a total mixed ration, in a 2 × 3 factorial design. The interaction of parity with grazing time did not affect milk production and protein content; however, dry matter intake of herbage, total dry matter intake and milk fat content were affected by the interaction (P < 0.05). Both factors affected the milk concentration of monounsaturated FAs. The 18 : 3 cis9 cis12, 18 : 2 cis9 trans11, and 18 : 3 cis9 cis12 cis15 concentrations in milk were higher (P < 0.05) in primiparous cows. Milk 18 : 2 cis9 trans11 concentration in primiparous cows with 12 h grazing (1.17 g/100 g FA) was 44% and 57% higher than with 6 h and 0 h grazing (0.66 and 0.50 g/100 g FA, respectively). Similar pattern was observed for 18 : 3 cis9 cis12 cis15. The milk 18 : 1 trans11 concentration was higher (P < 0.05) with 6 h and 12 h grazing than without grazing. In conclusion, the parity would appear to mainly affect the proportion of short-chain FAs, and had an important influence on the proportions of 18 : 2 cis9 trans11, and 18 : 3 cis9 cis12 cis15. These FAs and also 18 : 1 trans11 were modified by grazing time.
Additional keywords: calving, dairy milk, milk fat, pasture.
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