Milk production responses of primiparous and multiparous dairy cows to dose of conjugated linoleic acid consumed in rumen inert form

Abstract

Conjugated linoleic acid (CLA) has the potential to be used as a dietary means of manipulating milk fat production of dairy cows to meet specified short-term targets, as in a supply-managed industry. An experiment was conducted to evaluate the dose-response to calcium salts of CLA fed as a top-dress on a corn- and alfalfa-based TMR. In two 5 × 5 Latin squares of 28-d periods, five primiparous and five multiparous cows were fed 0, 22, 45, 67 or 178 g d-1 CLA (29% trans-10, cis-12) as a calcium salt. Results from one multiparous cow on the 178 g d-1 treatment were removed from statistical analysis because milk production fell to 1.2 kg d-1 by the end of the period. On average, milk, lactose and protein yields increased at the lower doses of CLA and decreased to control levels at the highest dose. Milk fat yield declined progressively from 876 to 770, 689, 676 and 543 g d-1 on the five doses. Net energy balance of cows increased linearly from -1.5 Mcal d-1 on the control to 2.0 Mcal d-1 at 178 g d-1 CLA. The percentage depression in milk fat yield at different doses of trans-10, cis-12 CLA was described by the equation y = 54/(1 + 22.8/dose). Comparison with published literature suggested that feeding calcium salts of CLA was 30% as effective in depressing milk fat production as an abomasal infusion, due to rumen biohydrogenation and intestinal indigestibility.Key words: Milk composition, cattle, diet

Effects of long-term supplementation of dairy cow diets with rumen-protected conjugated linoleic acids (CLA) on performance, metabolic parameters and fatty acid profile in milk fat

“…This finding is in accordance with the literature (Giesy et al 2002;Perfield et al 2002;Perfield et al 2004;Sippel et al 2009) where the CLAgroups exhibited an apparent, but also not significant, increase in milk yields of 13, 4, 5 and 9% respectively.…”

“…However, data regarding the long-term effects of CLA supplementation on dairy cows is still rare as most examinations were conducted either during the transition period and early lactation (Moore et al 2004;Selberg et al 2004;Castaneda-Gutierrez et al 2005;Odens et al 2007) or during a few weeks in mid lactation (Giesy et al 2002;de Veth et al 2005;Suksombat and Chullanandana 2008;Piamphon et al 2009;Sippel et al 2009;Moallem et al 2010). Only Perfield et al (2002) and Bernal-Santos et al (2003) performed studies over a 20-week period of lactation treatment, but their CLA supplement was a mixture of four isomers, including trans-8, cis-10 CLA; cis-9, trans-11 CLA; trans-10, cis-12 CLA; and cis-11, trans-13 CLA.…”

“…The trans-10, cis-12 CLA supplementation resulted in a more dramatic decrease in fatty acids originating from de novo synthesis (5C 16 ) compared with preformed fatty acids (4C 16 ) (Chouinard et al 1999;Baumgard et al 2000a;Kraft et al 2001;Shingfield et al 2009). In a study by Sippel et al (2009) who fed up to 51 g trans-10, cis-12 CLA/d for 4 weeks in mid-lactation the milk fat content decreased dose-dependently by up to 39% while milk yield and other milk components were unaltered. Consequently, the calculated energy balance was improved for the treatment groups.…”

State of the art in rumen lipid protection technologies and emerging interfacial protein cross‐linking methods

“…Besides variation in experimental conditions, the large variation in transfer efficiencies between experiments also might be related to differences in protection efficiency, probably induced by variation in production procedures of the Ca salts. Generally, very inconsistent results are found in literature dealing with Ca salts of unsaturated FA, but most of them reported an incomplete protection, supported by the many BH intermediates which were found in milk and/or rumen fluid .…”

Tocopherols and tocotrienols in serum and liver of dairy cows receiving conjugated linoleic acids or a control fat supplement during early lactation

“…Supplementation with trans-10,cis-12 CLA is used to reduce milk fat content in dairy cows as a dietary strategy aimed to improve energy balance, especially during early lactation (Sippel et al, 2009;Schlegel et al, 2012). The observation that CLA-fed laboratory animals have improved vitamin E status attracted interest in the interaction between vitamin E and CLA (Liao et al, 2008;Chao et al, 2010).…”