The Effect of Roasting Nonlinted Whole Cottonseed on Milk Production by Dairy Cows

Abstract

This study was conducted to examine the effect of roasting nonlinted whole cottonseed on ruminal crude protein (CP) degradability and performance in high-yielding dairy cows. Multiparous Israeli Holstein-Friesian cows (parity average 2.5+/-1.5; n = 132) with 571+/-65 kg of body weight (BW), 107+/-48 d in milk (DIM), and 37+/-5.8 kg of milk yield/d were used in the study. Cows were divided into two dietary treatment groups according to their BW, DIM, and milk production. The two diets were similar in CP, net energy for lactation, and neutral detergent fiber content [17%, 1.74 Mcal/kg, and 30% on a dry matter (DM) basis] and included either 15% (on a DM basis) whole cottonseed or roasted whole cottonseed. Ruminal effective degradability of CP, organic matter (OM), and ether extract (EE) decreased 14, 11, and 10%, respectively, compared to whole cottonseed. Total tract digestibilities of CP and EE were similar for both treatments and averaged 57 and 59%, respectively. However, DM and OM digestibilities were 6 and 5% higher in cows offered roasted whole cottonseed relative to those fed whole cottonseed diet. The inclusion of roasted whole cottonseed in the ration decreased ruminal ammonia and blood urea N concentration by 12% compared with diet with the raw whole cottonseed. Milk production, milk fat content, and production, and milk protein yield increased when roasted, nonlinted whole cottonseed was included in the diet. Milk protein content was similar for both treatments, averaging 2.92%.

Effect of processing whole cottonseed on yield and composition of milk in dairy cows

“…However, we observed that the milk protein was increased when cows were fed delinted and extruded WCS (P<0.05), which was consistent with some previous reports (Mabjeesh et al, 2000;Reveneau et al, 2005). This can be explained that microbial protein synthesis was improved when cows were fed processing WCS, resulting in an increase of protein fl ow in the small intestine.…”

“…Johnson et al (2002) reported that MUN was increased when cows were fed with oilseed. It is likely that free oil of extruded WCS has negative effect on rumen microbial protein and more nitrogen is absorbed across the ruminal wall and synthesized into MUN by the mammary gland (Mabjeesh et al, 2000). Milk lactose was not affected by the dietary factors (P>0.05).…”

“…Mabjeesh et al (2000) demonstrated that feeding roasted delinted WCS was more effective in creasing milk fat content of cis9, trans11-CLA than feeding linted WCS. Reveneau et al (2005) concluded that feeding small WCS pellets was more effective in increasing milk fat content of cis9, trans11-CLA than feeding large WCS pellets.…”

“…The supplemental fat from WCS increases the energy density of the diet, and the protein and oil contained in the seed are released slowly during mastication and to decrease the degradation in the rumen and increase milk protein and milk yield (Mabjeesh et al, 2000).…”

Effect of processing whole cottonseed on nutrient digestibility and ruminal fermentation in dairy cows

“…Extrusion of the cottonseed frees the seed oil and is likely associated with negative effects on rumen microbial growth (Mabjeesh et al, 2000) and NH 3 -N utilization in rumen.…”