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Effect of a high-palmitic acid fat supplement on milk production in Icelandic dairy cows fed grass silage-based diet

Effect of a high-palmitic acid fat supplement on milk production in Icelandic dairy cows fed grass silage-based diet


Title: Effect of a high-palmitic acid fat supplement on milk production in Icelandic dairy cows fed grass silage-based diet
Alternative Title: Áhrif fituíblöndunar í fóður mjólkurkúa á nyt og efnainnihald mjólkur
Author: Sveinbjörnsson, Jóhannes   orcid.org/0000-0001-7251-0219
Baldursdóttir, Hrafnhildur
Date: 2020
Language: English
Scope: 15-24
University/Institute: Landbúnaðarháskóli Íslands
Agricultural University of Iceland
Department: Auðlinda- og umhverfisdeild (LBHÍ)
Faculty of Natural Resources and Environmental Sciences (AUI)
Series: Icelandic Agricultural Sciences;2020(33)
ISSN: 2298-786X
DOI: 10.16886/IAS.2020.02
Subject: Kýr; Fóðrun dýra; Agronomy; Crop Science
URI: https://hdl.handle.net/20.500.11815/2653

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Citation:

Sveinbjörnsson, J., & Baldursdóttir, H. (2020). Effect of a high-palmitic acid fat supplement on milk production in Icelandic dairy cows fed grass silage-based diet. Icelandic Agricultural Sciences, 33, 15-24.

Abstract:

 
Thirty-seven dairy cows of the Icelandic breed were used in a change-over design experiment. The aim was to analyse the effects of moderate addition of high-palmitic acid (C16:0) fat supplement to a grass silage-based diet. There were three experimental treatments: a treatment with the fat supplement as powder (FAPOW); a treatment with the fat supplement in pelleted concentrate (FAPEL); and a control treatment (CONTROL). Milk protein content was significantly lower, and there was a tendency (p<0.10) toward a higher milk fat content in the fat treatments. This resulted in significantly higher milk fat:protein ratio in the fat treatments compared to the control (FAPOW 1.21 and FAPEL 1.20; CONTROL 1.15). A significant reduction in the ratio of casein in milk protein due to fat addition explains the reduction in milk protein. The concentration of free fatty acids in milk was higher in the fat treatments, especially FAPEL. The ratio of C16:0 in total fatty acids was increased by the fat treatments.
 
Tilraunin sem hér er sagt frá var skipulögð þannig að 37 íslenskar mjólkurkýr voru látnar prófa þrjár fóðurmeðferðir, í mismunandi röð. Markmiðið var að greina áhrif hóflegrar fituviðbótar, aðallega á formi pálmasýru (C16:0), í fóður mjólkurkúa þar sem vothey verkað úr grasi er undirstaðan. Fóðurmeðferðirnar þrjár voru: fituviðbót á formi þurrfitu (FAPOW); fituinnblöndun í kjarnfóðurblöndu (FAPEL); og viðmiðunarfóðrun án fituviðbótar (CONTROL). Hlutfall próteins í mjólk var lægra og tilhneiging til hærra mjólkurfituhlutfalls þegar fitu var bætt í fóðrið. Þetta leiddi til marktækt hærra fitu: prótein hlutfalls í mjólkinni í fóðurmeðferðum með viðbótarfitu í samanburði við viðmið (FAPOW 1.21 og FAPEL 1.20, samanborið við CONTROL 1.15). Lækkun á hlutfalli kaseins í mjólkurpróteini vegna fituviðbótar í fóðri skýrir áðurnefnda lækkun á heildarpróteini í mjólk. Styrkur frjálsra fitusýra í mjólk var hærri þegar fitu var bætt í fóður, sérstaklega þegar það var gert í gegnum kjarnfóðurblöndu (FAPEL). Hlutfall pálmasýru af fitusýrum í mjólk var hærra þegar fitu var bætt í fóðrið.
 

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