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Influence of pumpkin seed cake and extruded linseed on milk production and milk fatty acid profile in Alpine goats

Published online by Cambridge University Press:  03 April 2017

Z. Klir ,
J. M. Castro-Montoya ,
J. Novoselec ,
J. Molkentin ,
M. Domacinovic ,
B. Mioc ,
U. Dickhoefer  and
Z. Antunovic
Z. Klir
Affiliation:
Department for Animal Husbandry, Faculty of Agriculture in Osijek, University of J. J. Strossmayer, V. Preloga 1, 31000 Osijek, Croatia
J. M. Castro-Montoya
Affiliation:
Institute of Agricultural Sciences in the Tropics, University of Hohenheim, Fruwirthstrasse 31, 70593 Stuttgart, Germany
J. Novoselec
Affiliation:
Department for Animal Husbandry, Faculty of Agriculture in Osijek, University of J. J. Strossmayer, V. Preloga 1, 31000 Osijek, Croatia
J. Molkentin
Affiliation:
Department of Safety and Quality of Milk and Fish Products, Max Rubner-Institute, Hermann-Weigmann-Strasse 1, 24103 Kiel, Germany
M. Domacinovic
Affiliation:
Department for Animal Husbandry, Faculty of Agriculture in Osijek, University of J. J. Strossmayer, V. Preloga 1, 31000 Osijek, Croatia
B. Mioc
Affiliation:
Department of Animal Science and Technology, Faculty of Agriculture, University of Zagreb, Svetosimunska cesta 25, 10000 Zagreb, Croatia
U. Dickhoefer*
Affiliation:
Institute of Agricultural Sciences in the Tropics, University of Hohenheim, Fruwirthstrasse 31, 70593 Stuttgart, Germany
Z. Antunovic
Affiliation:
Department for Animal Husbandry, Faculty of Agriculture in Osijek, University of J. J. Strossmayer, V. Preloga 1, 31000 Osijek, Croatia
*
†E-mail: uta.dickhoefer@uni-hohenheim.de
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Abstract

The aim was to determine the effect of substituting pumpkin seed cake (PSC) or extruded linseed (ELS) for soya bean meal in goats’ diets on milk yield, milk composition and fatty acids profile of milk fat. In total, 28 dairy goats were divided into three groups. They were fed with concentrate mixtures containing soya bean meal (Control; n=9), ELS (n=10) or PSC (n=9) as main protein sources in the trial lasting 75 days. Addition of ELS or PSC did not influence milk yield and milk gross composition in contrast to fatty acid profile compared with Control. Supplementation of ELS resulted in greater branched-chain fatty acids (BCFA) and total n-3 fatty acids compared with Control and PSC (P<0.05). Total n-3 fatty acids were accompanied by increased α-linolenic acid (ALA, C18:3n-3; 0.56 g/100 g fatty acids) and EPA (C20:5n-3; 0.12 g/100 g fatty acids) proportions in milk of the ELS group. In contrast, ELS and PSC resulted in lower linoleic acid (LA, C18:2n-6; 2.10 and 2.28 g/100 g fatty acids, respectively) proportions compared with Control (2.80 g/100 g fatty acids; P<0.05). Abovementioned resulted in lower LA/ALA ratio (3.81 v. 7.44 or 6.92, respectively; P<0.05) with supplementation of ELS compared with Control or PSC. The PSC diet decreased total n-6 fatty acids compared with the Control (2.96 v. 3.54 g/100 g fatty acids, P<0.05). Oleic acid (c9-C18:1), CLA (c9,t11-18:2) and t10-,t11-C18:1 did not differ between treatments (P⩾0.08), although stearic acid (C18:0) increased in ELS diets compared with Control (12.7 v. 10.2 g/100 g fatty acids, P<0.05). Partially substituted soya bean meal with ELS in hay-based diets may increase beneficial n-3 fatty acids and BCFA accompanied by lowering LA/ALA ratio and increased C18:0. Pumpkin seed cake completely substituted soya bean meal in the diet of dairy goats without any decrease in milk production or sharp changes in fatty acid profile that may have a commercial or a human health relevancy.

Keywords

fatty acid profileextruded linseedpumpkin seed cakegoat milk
Type
Research Article
Information
animal , Volume 11 , Issue 10 , October 2017 , pp. 1772 - 1778
Copyright
© The Animal Consortium 2017 

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