Sources of polyunsaturated fatty acids from oilseeds in dairy cows diets can alter yield of and fatty acid profile in milk

Abstract

Our hypothesis was that different sources of unsaturated fatty acids from oilseeds (sunflower, soybeans, and cottonseed) could alter milk yield, fatty acid profile, and the amount of unsaturated fatty acids yielded in milk. It aimed to evaluate the effects of lipid sources on yield and composition and fatty acids in milk of primiparous Girolando cows. Five cows in lactation (35 ± 8 days), with 410 ± 7.15 kg BW were randomly distributed in a 5 x 5 Latin square. Five experimental diets, namely a control diet without an additional source of lipid and four diets with different lipid sources: cottonseed, sunflower seed, whole soybean, or soybean oil, as lipid source, to reach 70 g/kg of ethereal extract dry matter basis were used. Cottonseed and soybean oil addition reduced daily yield by 15 and 22%. Oilseed can alter fatty acid profile in milk. Whole soybean provided greater daily milk and fatty acids yields.

Productive and economic performance of feedlot young Nellore bulls fed whole oilseeds

“…Despite the fact that the lipid content in the diets with oilseeds inclusion did not exceed 70 g/kg, which is a limit established for cattle, so that there are no adverse effects on intake (NASEM, 2016;Kozloski, 2011), there was a reduction on DMI in all oilseed diets. Nevertheless, lipids are advantageous in diets due to their high energy value, which should be used without harmful effects of FA on rumen fermentation (Ítavo et al, 2005) with possible modification of FA in meat (Ítavo et al, 2021;Miyaki et al, 2022;Rodrigues et al, 2022) and in milk (Wanderley et al, 2022).…”

“…The FA in the meat of young bulls fed oilseeds were altered by diet. Oilseeds in the diets of beef cattle (Ítavo et al, 2021) and lambs (Rodrigues et al, 2022) can alter the FA profile in meat and milk (Wanderley et al, 2022;Rufino et al, 2023). The supplementation with oilseeds increases the healthpromoting index of milk and meat since its use can reduce SFA and increase PUFA in animal products.…”

“…The authors concluded that this can be an effective strategy to reduce the proportion of SFA and increase UFA in meat, which can be beneficial for human consumption. Wanderley et al (2022) found that oilseeds can alter the fatty acid (FA) profile in the milk of Girolando dairy cows and concluded that whole soybean provides greater milk and FA yields. In the same way, Rodrigues et al (2022) found that lambs treated with whole soybean have greater amounts of FA, mostly UFA, in their meat.…”

The Effects of Feeding Milled Rapeseed Seeds with Different Forage:Concentrate Ratios in Jersey Dairy Cows on Milk Production, Milk Fatty Acid Composition, and Milk Antioxidant Capacity

“…In this research, this conclusion was not confirmed, because the supplementation of diets with MR, which have a high content of OA, did not increase the concentration of cis -9, trans -11 CLA in milk, which means that the intake increased OA in the feed did not increase the concentration of VA in the rumen. There is research that showed that supplementing the diet with vegetable oils increased the concentration of cis -9, trans -11 CLA in milk fat in the first week and then decreased and remained relatively constant [ 9 , 20 , 58 ]. In this research, the determination of the FAs profile in milk was conducted in the third week after the start of supplementing the diet with MR.…”

“…The FAs profile of milk depends on several factors; nutritional management being one of most important [ 7 , 8 ]. Supplementing cow diets with different sources and types of fat is an effective way of manipulating the FAs profile of milk fat [ 3 , 9 , 10 ]. Previous research demonstrated that supplementing cow diets with vegetable oils led to an increase in n-3 FAs and CLA concentration in milk fat [ 7 , 11 ].…”