1842
Effect of reduced energy density of close-up diet on dry matter intake, milk yield and energy balance in multiparous Holstein cows

Wednesday, July 23, 2014
Exhibit Hall AB (Kansas City Convention Center)
Wen-Ming Huang , State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing, China
Amina Simayi , State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing, China
Amingul Yasheng , State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing, China
Zhao-Hai Wu , State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing, China
Sheng-Li Li , State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing, China
Zhi-Jun Cao , State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing, China
Abstract Text:

The objective of this study was to determine the effect of reduced energy density of close-up diet on DMI, milk yield and energy balance (EB) in multiparous Holstein cows which were fed for ad libitum intake. Thirty-nine dry cows were blocked and assigned randomly into 1 of 3 energy concentrations (6.8, 6.2, 5.4 MJ of NEL/kg; 14.0 % CP) diets to meet 100% (100NRC; n = 13), 90% (90NRC; n = 13), 80% (80NRC; n = 13) of the NRC (2001) dietary NEL recommendation, respectively, from 21 d before expected day of calving. After parturition, all cows were fed the same lactation diet to 70 d in milk (DIM). Data were analyzed by SPSS with repeated measures procedure or One-Way ANOVA procedure. The DMI (14.3, 13.6, 12.6 kg/d; P = 0.009 ) and NEL intake (NEI, 97.1, 83.3, 68.6 MJ/d; P < 0.001 ) prepartum were significantly different for 100NRC, 90NRC and 80NRC groups. In the last 24 h before calving, the 80NRC group consumed 1.3 kg and 0.7 kg more diet (DM) than the 100NRC and 90NRC groups (P > 0.05), respectively, but the NEI was very similar among the 3 treatments. During the first 4 wk postpartum, the DMI and NEI for the 80NRC group were numerically greater than those for the 100NRC (P > 0.05). The milk yields of 90NRC and 80NRC groups were numerically greater than 100NRC from 1 to 10 wk (36.6, 38.6, 38.7 kg/d; P > 0.05), but the 4% fat-corrected milk yields (45.4, 45.7, 45.4 kg/d; P > 0.05) were very similar due to the significantly higher milk fat content for 100NRC. The energy consumption for 100NRC, 90NRC and 80NRC were 149.8%, 126.2% and 101.1% of their calculated energy requirements prepartum, and 72.7%, 73.1% and 75.2% during the first 4 wk postpartum, respectively. In conclusion, the low energy density prepartum diet was effective in controlling NEI prepartum, and was beneficial in increasing DMI, whilst alleviating negative EB postpartum.

Keywords:

dietary energy density, dry matter intake, milk yield

See more of: Ruminant Nutrition Posters III
See more of: Ruminant Nutrition
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