Abstract:
Effect of diets containing untreated or processed barley grain [treated with sugar
beet pulp extract (SBPE) or double sulphate of aluminium and potassium (ALUM)] and
different levels of rumen undegradable crude protein (RUP) on production, rumen
fermentation and blood metabolites of lactating Holstein cows were investigated.
Untreated soybean meal (SBM) or xylose protected ‘Yasminomax soy® (YAS)’ was included
to represent a low (LR, 4.2% DM) and high (HR, 5.4% DM) RUP diets, respectively.
Experimental diet was as follows: (a) untreated barley grains with high RUP
(HRCON); (b) untreated barley grains with low RUP (LRCON); (c) ALUM-treated
barley
grain with high RUP (HRAL; (d) ALUM-treated
barley grain with low RUP (LRAL); (e)
SBPE-treated
barley grain with high RUP (HRSE); and (f) SBPE-treated
barley grain
with low RUP (LRSE). The experiment was conducted as a completely randomized
design with lactating dairy cows (n = 36) averaging 215 ± 18 days in milk, milk yield
31.7 ± 5.8 kg/day, 620 ± 61 kg body weight. Diets containing processed barley grain
increased feed intake, while decreased both rumination and eating (p < 0.001). Feed
intake of dairy cows on Low RUP and High RUP were 23 and 24 kg/day, respectively
(p < 0.01). Daily production of milk fat, protein, lactose and total solids was improved
when the processed barley grain was included in the diets (p < 0.05). Present study
pinpointed that the inclusion of the processed barley grain in diets might improve
production indices of dairy cows.
K E Y W O R D S
bypass starch, dairy cow, production performance, protein
Publisher: Journal of Animal Physiology and Animal Nutrition: Volume 106, Issue 3, 506-516
Qurtiles : Q1
IMPACT FACTOR: 3.29
Country: United Kingdom
Target Animal: Dairy Cow
Product under study: Yasminomax