Effects of rumen-protected conjugated linoleic acid (CLA) on performance of primiparous and multiparous cows in the transition period

Zygmunt Kowalski , Paweł Górka , Piotr Micek , Jolanta Oprządek , Arnulf Tröscher

Abstract

The aim of this study was to determine if the production effects of dietary rumen-protected conjugated linoleic acid (RP-CLA) supplemented to dairy cows during the transition period depend on parity. Twenty four Polish Holstein-Friesian pregnant cows and sixteen pregnant heifers were allocated to four treatments: 1. primiparous cows fed a diet without RP-CLA; 2. primiparous cows fed a diet with RP-CLA (60 g/cow/day); 3. multiparous cows fed a diet without RP-CLA; and 4. multiparous cows fed a diet with RP-CLA (60 g/cow/day). The RP-CLA was offered in pre- and postpartum total mixed ration diets from day 21 before expected parturition until day 60 after parturition. Dry matter intake, milk yield and fat, and energy corrected milk yield were not affected by RP-CLA supplementation. RP-CLA supplementation reduced milk fat content by 10.9%, but had no effect on either protein or lactose content, or on yield of fat, protein and lactose. Body condition score (BCS), BCS changes and energy balance (EB) were not affected by RP-CLA addition. Plasma insulin-like growth factor 1 concentration increased in multiparous, but decreased in primiparous cows in response to RP-CLA supplementation (parity × diet interaction). The results of this study confirm that RP-CLA supplementation in transition period lowers milk fat content, but has no effect on milk energy output and EB of the cows. Although multiparous cows had a tendency for a greater decrease in milk fat content due to RP-CLA supplementation, an effect of RP-CLA on milk yield, milk composition and EB in primi- and multiparous cows was similar.
Author Zygmunt Kowalski (FoAS / DoANaD)
Zygmunt Kowalski,,
- Department of Animal Nutrition and Dietetics
, Paweł Górka (FoAS / DoANaD)
Paweł Górka,,
- Department of Animal Nutrition and Dietetics
, Piotr Micek (FoAS / DoANaD)
Piotr Micek,,
- Department of Animal Nutrition and Dietetics
, Jolanta Oprządek
Jolanta Oprządek,,
-
, Arnulf Tröscher
Arnulf Tröscher,,
-
Journal seriesJournal of Animal and Feed Sciences, ISSN 1230-1388, (N/A 40 pkt)
Issue year2019
Vol28
No3
Pages220-229
Publication size in sheets0.5
Keywords in Englishconjugated linoleic acid, dairy cows, energy balance, milk fat, milk yield, parity
ASJC Classification1103 Animal Science and Zoology; 1106 Food Science
DOIDOI:10.22358/jafs/110083/2019
URL http://www.jafs.com.pl/pdf-110083-42341?filename=Effects%20of.pdf
Languageen angielski
LicenseJournal (articles only); author's original; Uznanie Autorstwa - Użycie Niekomercyjne (CC-BY-NC); after publication
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Effects of rumen-protected conjugated linoleic acid (CLA) on performance of primiparous and multiparous cows in the transition period of 27-09-2019
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Score (nominal)40
Score sourcejournalList
Publication indicators WoS Citations = 0; Scopus SNIP (Source Normalised Impact per Paper): 2018 = 0.439; WoS Impact Factor: 2018 = 0.875 (2) - 2018=0.906 (5)
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