TY - JOUR ID - 20809 TI - A Comparison of Lactating Dairy Cows Performance Fed Rations Formulated by National Research Council 2001 and Cornell Pennsylvania Miner JO - Iranian Journal of animal Science JA - IJAS LA - en SN - 2008-4773 AU - Nikkhah, Ali AU - Kazemi, Mehdi AU - Amanlou, Hamin AU - Mehrabani, Hsan AD - Y1 - 2009 PY - 2009 VL - 40 IS - 3 SP - EP - KW - . KW - Cornell Pennsylvania Miner (CPM) KW - Formulating dairy ration KW - Lactating dairy cows KW - National Research Council 2001 (NRC 2001) DO - N2 - The precision and accuracy of National Research Council (NRC 2001) vs. Cornell Pennsylvania Miner (CPM) softwares were evaluated. Sixteen lactating dairy cows (8 in second lactation and 8 in third, with days in milk of 55 ± 31, body live weight = 641 ± 53 Kg, milk yield =31.2 ± 2.5 Kg/day), were assigned to individual pens in a randomized complete block design, with two blocks of two ration treatments (each treatment including 4 cows in second lactation and 4 in the third). The cows were fed rations formulated by NRC 2001 (A) and CPM (B), as totaly mixed rations (TMR) for 90 days. The adaptation consisted of a period of two weeks from the beginning of the experiment. The average milk yields of cows fed with diet A vs. B were 31.11 and 31.9, respectively with no significant difference observed between the two groups for the mentioned trait (p>0.05). There was no significant difference observed for dry matter intake (DMI) in the two ration treatments (p>0.05), the average dry matter intake of diets A vs. B being 22.9 and 22.33 Kg/day, respectively. Both NRC 2001 and CPM underpredicted DMI (-0.63 and -2.43 Kg/day respectively) while the National Research Council model predicting DMI somehow more accurately (in lactating dairy cows) than CPM. Average daily crude protein intakes for diets A vs. B were 3618 and 3438 g/d, respectively (P UR - https://ijas.ut.ac.ir/article_20809.html L1 - https://ijas.ut.ac.ir/article_20809_5418cf565ae7a3bb45a3dfa735ab97dc.pdf ER -