Effects of lipid supplementation on the yield and composition of milk from cows with different β-lactoglobulin phenotypes

Abstract

Responses to lipid supplementation differ between dairy breeds and genetic lines suggesting nutrition by genotype interactions. beta-Lactoglobulin phenotype is associated with changes in yield and composition of milk. The response of cows with different beta-lactoglobulin phenotypes to lipid supplementation has not been examined. Furthermore, we examined whether lipid supplementation alters milk protein composition. By using a randomized block design, we fed Holstein cows for 3 wk either a control diet containing 2.8% crude fat (n = 19) or an experimental diet that was supplemented with 4.2% tallow (n = 20). Before randomization, all cows were fed the supplemental tallow diet for at least 2 wk. Dry matter intake, body weight, milk yield, and milk composition were measured in the last week before and during the experimental period. Feeding supplemental tallow increased dry matter intake and yields of milk and milk components, including casein content, without decreasing milk component content or altering milk protein composition. On the low-fat control diet, cows with the beta-lactoglobulin allele B had a greater milk and milk component yield than cows with the A allele, whereas no differences by beta-lactoglobulin phenotype were observed in cows on the tallow supplement diet. Our results suggest that cows that differ in beta-lactoglobulin phenotype respond differently to a low-fat diet and that feeding cows 4.2% of additional tallow increases milk yield without affecting milk component content and milk protein composition.

Effect of dietary supplementation of pasture-based primiparous Holstein-Friesian cows with degummed crude canola oil on body condition score, liveweight, milk yield and composition

“…Variation in results from a few pasture-based systems has also been observed (Kay et al 2007;Hutchinson et al 2011). The findings in this current study agree with previous authors who reported an increase in milk yield (Khorasani et al 1991;Chilliard et al 2001;Bobe et al 2009;Hutchinson et al 2012), but contrasts with others who reported either a decrease or no effect on milk production (Bayourthe et al 2000;Chichlowski et al 2005;Bernal-Santos et al 2010;Caroprese et al 2010;He & Armentano 2011). Our finding in this study also concurs with the assertion of increased milk production in cows supplemented with DCCO.…”

Effect of different fat supplements on the antioxidant capacity of cow’s milk

“…Experimental cows were in the late lactation stage, therefore, characterized by higher concentration of milk protein. Positive influence of fatty supplements on protein content was also confirmed by Bobe et al (2009) experiment. However, Flowers et al (2008 found that supplementation of cow diet with flax seeds (0.17, 0.34 and 0.51 kg/day) does not influence the performance and content of basic components in the milk protein.…”

Epigenetic Regulation of miR‐29s Affects the Lactation Activity of Dairy Cow Mammary Epithelial Cells

“…With the development of the dairy industry, increasing attention has been devoted to the potential role of epigenetic mechanisms in the regulation of mammary function in dairy cows. Epigenetic initiator signals can influence milk synthesis in genetically selected animals and can alter the expected lactation performance of an animal (Bobe et al, ). DNA methylation, as a key epigenetic signature, is involved in regulating TG biosynthesis (Ehara et al, ).…”