1865
Effects of Dietary Protein Composition on Blood Hormone Levels in Dairy Cattle

Wednesday, July 23, 2014
Exhibit Hall AB (Kansas City Convention Center)
Meng Zhao , State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, China
Deng-pan Bu , State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, China
Jia-qi Wang , State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, China
Xiao-qiao Zhou , Northeast Agricultural University, Harbin, China
Yangdong Zhang , State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, China
Peng Sun , State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, China
Abstract Text:

The objective of this experiment was to investigate the effects of different protein sources on blood hormones profile. Thirty two dairy cows were pen fed with total mixed ration (TMR), which were divided into group soybean (corn stover 36.1%, soybean meal 11.3%, extruded soybean 2.1%, whole cottonseed 10.4%, rapeseed meal 4.2% , cottonseed meal 2.1%, beet pulp 4.2%, grind corn 25.6% and other supplements 4.1%) and group non-soybean (corn stover 36.1%, whole cottonseed 10.4%, rapeseed meal 9.6%, cottonseed meal 6.7%, beet pulp 7.5%, grind corn 25.6%, wheat bran 4.5% and other supplements 1.7%). Crude protein (CP) and neutral detergent fiber (NDF) of TMR were 16.1% vs 15.1% and 54.0% vs 57.1% in group soybean and group non-soybean, respectively. The duration of this experiment was 15 wk (2-wk adaptation and 13-wk experimental period). Nine hormones were determined by radioimmunoassay method including insulin, growth hormone (GH), insulin-like growth factor-1 (IGF-1), Adrenocorticotropic hormone (ACTH), Leptin, Estrogen, Cortisol, Prolactin and Progestin. Statistical analysis was performed using the PROC MIXED procedure of SAS 9.0. Dry matter intake (DMI) and milk yield were 17.4 vs 19.1 kg/d (P < 0.01) and 23.2 vs 22.9 kg/d (P > 0.05) in group soybean and group non-soybean. Concentrations of hormones were averaged insulin (13.44 vs 12.55 µIU/ml, P > 0.05), IGF-1 (384.31 vs 286.33 ng/ml, P < 0.01), ACTH (9.67 vs 6.00 pg/ml, P < 0.05), Estrogen (10.69 vs 10.44 pg/ml, P > 0.05), GH (2.37 vs 2.26, P > 0.05), Leptin (3.67 vs 3.32 ng/ml, P > 0.05), Progestin (0.38 vs 0.36 ng/ml, P > 0.05), Prolactin (175.51 vs 174.00 µIU/ml, P > 0.05) and Cortisol (10.92 vs 7.38, P > 0.05) in group soybean and group non-soybean, respectively. It demonstrated that protein sources could significantly influence DMI and have no effect on milk yield, which can also influence the function of hypothalamus pituitary adrenal axis and stimulate the cell proliferate.

Keywords: protein source, blood hormone, dairy nutrition

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