Effects of fat-protein supplementation of diets for cows in early lactation on milk yield and composition

Abstract

An experiment was performed on 37 Holstein-Friesian cows during the first 120 days of lactation. The cows were fed balanced diets composed of haylage and maize silage (together 52% dry mater) and a concentrate containing 19% crude protein (group 1), a concentrate containing 17.5% crude protein and 1 kg of fat-protein supplement Megapro Plus ® (group 2) or a concentrate containing 19% crude protein and 1 kg of fat-protein supplement Megapro Plus ® (group 3). The mean daily milk yield recorded in groups 2 and 3 amounted to 32.6 kg/dand was by 10.3% higher than in the control group (P ≤ 0.01). FCM yield increased by 15.5% and 12.1% in groups 2 and 3, respectively, in comparison with group 1. Diet supplementation with Megapro Plus ® had no significant effect on the levels of fat, lactose, protein, nitrogen fractions and urea, or some physicochemical properties of milk (density, pH, heat stability). A decrease was noted in solids-non-fat (group 2) and somatic cell count (P ≤ 0.05). Megapro Plus ® supplementation of a diet with a reduced (to 3%) "00" rapeseed meal content in concentrate (group 2) resulted in a significant increase in the concentrations of unsaturated fatty acids (especially C18:1 and C18:2) and hypocholesterolaemic acids (DFA) in milk, recorded on the 120th day of lactation. Megapro Plus ® supplementation of a concentrate with a high (10%) "00" rapeseed meal content aimed at increasing the concentrations of both energy and protein (group 3), had no significant effect on improvement in the fatty acid profile, i.e. changes towards increasing unsaturation of milk fat.

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“…Supplementation of protected fat and protein did not affect total DM intake of buffaloes in both the groups. Similar to the results obtained in the present study, Strusinska et al (2006), Thakur and Shelke (2010) and Silvestre et al (2011) did not observe any effect of supplementing rumen protected fat to cows and buffaloes on DM intake. Generally, digestibility of fat in ruminant diet is low due to high content of non-fatty material and the small proportion of true fat in the total diet, which causes endogenous secretions to be relatively high (Palmquist and Jenkins, 1980).…”

Effect of Flaxseed Oil Supplemention During Pre and Postpartum on Some Physiological Parameters and Productive Performance of Friesian Cows

“…Somatic cell count was decreased in cows treated with flaxseed oil diet than control group, being of 40.1% compared with control. These results are similar to those obtained by Strusinska et al (2006), who reported that somatic cell count decreased during the first 120 days of lactation by Megapro Plus® supplementation to diet. Also, Abu El-Hamd et al (2012) found that the SCC was lower (P<0.01) by about 19.52% for cows fed protected fat than the control.…”

Fatty acid composition of cow milk fat produced on low-input mountain farms

“…Aside from the animal factors, like the breed, parity or stage of lactation (Jensen, 2002;Kelsey et al, 2003;Pietrzak-Fiećko et al, 2009), the nutrition substantially determines the FA composition in the milk fat (Jenkins and McGuire, 2006;Strusińska et al, 2006;Hanuš et al, 2008;Liu et al, 2008;Jalč et al, 2009;Kudrna et al, 2009;Veselý et al, 2009). The addition of forage, especially of fresh grass, into feeding rations was found to enhance the proportion of unsaturated FAs in cow milk fat compared to saturated FAs (Dewhurst et al, 2006;Elgersma et al, 2006).…”