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Effect of different forage species supplemented with two carbohydrate sources on short and medium chain fatty acids in sheep milk

Cabiddu, Andrea and Addis, Margherita and Pinna, G. and Decandia, Mauro and Sitzia, Maria and Pirisi, Antonio and Piredda, Giovanni (2007) Effect of different forage species supplemented with two carbohydrate sources on short and medium chain fatty acids in sheep milk. Italian Journal of Animal Science, Vol. 6 (Suppl. 1), p. 542-544. eISSN 1828-051X. Article.

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DOI: 10.4081/ijas.2007.1s.542

Abstract

Sixty four Sarda dairy sheep fed with diets based on fresh forage were allocated to eight groups to evaluate the effect of corn or beet pulp based supplementation on milk fatty acid composition. Four forage species were compared: annual ryegrass (RY, Lolium rigidum Gaudin), sulla (SU, Hedysarum coronarium L.), burr medic (BM, Medicago polymorpha L.), and garland, a daisy forb, (CH, Chrysanthemum coronarium L.). The supplements were iso-nitrogenous but differed in carbohydrate composition consisting either of 60% (DM) of corn (concentrate C) or 40% sugar beet pulp (concentrate BP). The supplementation was iso-energetic (500 and 530 g/d, respectively). Overall during winter period (growing stage of the forages) SU and RY groups showed higher levels of atherogenicity index and C16:0. In winter period BP outperformed C for palmitic acid. In spring AI showed a trend similar to that of winter. Moreover C concentrate gave a better level of AI and myristic acid than BP. This study confirms that forage species and, to a lesser extent, carbohydrate source in the supplement markedly affect mediumchain FA profile and hence atherogenicity index in sheep milk.

Item Type:Article
ID Code:5772
Status:Published
Refereed:Yes
Uncontrolled Keywords:Dairy products, sheep, fatty acid, concentrate
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/19 Zootecnica speciale
Divisions:002 Altri enti e centri di ricerca del Nord Sardegna > Istituto zootecnico e caseario per la Sardegna, Olmedo
Publisher:Avenue media on behalf of Scientific Association of Animal Production (ASPA)
eISSN:1828-051X
Publisher Policy:Depositato per gentile concessione dell'ASPA
Additional Information:Relazione presentata al 17. Congresso nazionale ASPA, Alghero, 29 maggio-1 giugno 2007.
Deposited On:21 Mar 2011 12:58

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