Effects of Forage Level of Total Mixed Ration on Sorting Behavior, Rumen Content and Serum Indicators of Dairy Cows

JIANG Fugui, LIN Xueyan, YAN Zhengui, HOU Qiuling, WANG Yun, HU Zhiyong, WANG Zhonghua

doi:10.3969/j.issn.1006-267x.2018.07.016

Chinese Journal of Animal Nutrition >

2018 , Vol. 30 >Issue 7: 2561 - 2570

DOI: https://doi.org/10.3969/j.issn.1006-267x.2018.07.016

Molecular Nutrition

Effects of Forage Level of Total Mixed Ration on Sorting Behavior, Rumen Content and Serum Indicators of Dairy Cows

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1. College of Animal Science and Technology, Shandong Agricultural University, Tai'an 271018, China;
2. Institute of Animal Science and Veterinary Medicine, Shandong Academy of Agricultural Sciences, Jinan 250100, China;
3. Shandong Key Lab of Animal Disease Control and Breeding, Jinan 250100, China

Received date: 2018-02-20

Online published: 2018-07-20

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Abstract

This experiment was conducted to study the effects of forage level of total mixed ration on sorting behavior, rumen content and serum indicators of dairy cows. Twelve multiparous Holstein dairy cows[body weight was (616.8±44.3) kg]at mid-lactation[days in milk was (119±26) d] were randomly assigned to 4 groups in a 4×4 Latin square experiment with one cow surgically fitted with rumen cannula in each group. Cows were fed total mixed rations containing 40%, 50%, 60% and 70% roughage (dry matter basis), respectively.There were 4 stage animal tests, each stage lasted for 21 days. The results showed that dietary forage level significantly affected sorting behaviour of cows (P<0.05 or P<0.01). Cows sorted particles retained above 4 mm sieves and sorted against particles retained below 4 mm sieves when dietary forage level was 40%; However, cows sorted particles retained below 4 mm sieves and sorted against particles retained above 4 mm sieves when dietary forage level was greater than 40%. Dietary forage level did not affect the particle size distribution in rumen (P>0.05). When dietary forage level increased, the rumen liquid outflow velocity and rumen solid outflow velocity were linearly increased (P<0.05), but the rumen content weight and rumen liquid volume did no changed (P>0.05), the serum insulin like growth factor-1 (IGF-1) content was linearly increased (P<0.05), the contents of leptin (LEP) and non esterified fatty acids (NEFA) in serum tended to increase (0.05 ≤ P < 0.10), and the contents of growth hormone (GH) and insulin (INS) in serum tended to decrease (0.05 ≤ P < 0.10). In conclusion, dietary forage level is an important factor on sorting behavior, rumen content and serum indicators.

Key words： dairy cow; dietary forage level; sorting behavior; rumen content; serum indicators

Cite this article

JIANG Fugui, LIN Xueyan, YAN Zhengui, HOU Qiuling, WANG Yun, HU Zhiyong, WANG Zhonghua . Effects of Forage Level of Total Mixed Ration on Sorting Behavior, Rumen Content and Serum Indicators of Dairy Cows[J]. Chinese Journal of Animal Nutrition, 2018 , 30(7) : 2561 -2570 . DOI: 10.3969/j.issn.1006-267x.2018.07.016

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