TY - JOUR ID - 363 TI - Effects of supplementation with sodium caseinate of early lactation diet on performance, digestibility, microbial nitrogen flow, and nitrogen efficiency in Holstein cows JO - Iranian Journal of Veterinary Research JA - IJVR LA - en SN - 1728-1997 AU - Kazemi-Bonchenari, M. AU - Rezayazdi, K. AU - Nikkhah, A. AU - Kohram, H. AU - Dehghan-Banadaky, M. AD - Department of Animal Sciences, Faculty of Agriculture and Natural Resources, Arak University, Arak, Iran AD - Department of Animal Sciences, College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran Y1 - 2012 PY - 2012 VL - 13 IS - 3 SP - 234 EP - 240 KW - Early lactating cows KW - Sodium caseinate KW - Nitrogen efficiency DO - 10.22099/ijvr.2012.363 N2 - Performance, digestibility of nutrients, microbial nitrogen flow (MNF) and nitrogen efficiency (NE) inearly lactating Holstein cows were investigated by diet supplementation with sodium caseinate (CN).Multiparous lactating Holstein cows (n = 15) with an average body weight of 638 kg and 21 days in milkwere assigned to a completely randomized design (five cows per treatment) and fed a basal diet with different CN levels (treatments 1, 2, and 3, contained 0, 50, and 100, g/d/head CN, respectively). The study lasted 49 days (first 14 days for adaptation and the last 35 days for collection of data). There were no statistical differences in dry matter intake, milk yield, milk lactose yield, and protein yield with CN supplementation. 3.5% fat corrected milk yield was increased by CN supplementation (P<0.05). Digestibility of ADF was increased by CN supplementation (P<0.05). The higher level of CN affected MNF was estimated by spot urine sampling technique (P<0.05). Predicted N excretion through urine was affected (P<0.05); however, there was no effect of CN supply on predicted N excretion through faeces. In conclusion, the results indicated that although supplementation with CN improved MNF, negligible effects on performance of the cows were observed. Furthermore, increased milk urea nitrogen (MUN) concentration and predicted urine N excretion revealed the lower NE in early lactating dairy cows supplemented with CN compared with control treatment. UR - https://ijvr.shirazu.ac.ir/article_363.html L1 - https://ijvr.shirazu.ac.ir/article_363_a21b76fac9b5e86deb71df65f1045f1c.pdf ER -