Effects of Physically Effective Neutral Detergent Fiber Content on Intake, Digestibility, and Chewing Activity in Fattening Heifer Fed Total Mixed Ration

Asian-Australasian Journal of Animal Sciences

Byong Tae Jeon¹  Eun Kyung Kim¹  Hong Liang Li¹  Yu Ling Ding¹  Heeok Hong¹  Se Young Jang¹  Cheong Hee Choi¹  Mi Rae Oh¹  Yu Jiao Tang¹  Hye Jin Seong¹  Sang Ho Moon¹ 

[1] Department of Medical Science, School of Medicine, Konkuk University, Seoul 05029, Korea;

关键词: Physically Effective Neutral Detergent Fiber;    Chewing Activity;    Digestibility;    Dry Matter Intake;    Fattening Heifer;    Total Mixed Ration;   

DOI  :  10.5713/ajas.16.0344

来源: DOAJ

【 摘 要 】

The objective of this study was to determine the effects of physically effective neutral detergent fiber (peNDF) content in total mixed ration (TMR) on dry matter intake, digestibility, and chewing activity in fattening Hanwoo (Bos taurus coreanae) heifers. The experiment was designed as a replicated 3×3 Latin square using 12 heifers. Fattening heifers were offered one of three diets [high (T1), medium (T2), and low (T3) peNDF] obtained by different mixing times (3, 10, and 25 min) for the same TMR feed. The peNDF content of TMR was determined by multiplying the proportion of dry matter retained by a 1.18 mm-screen in a Penn State Particle Separator by the dietary NDF content. The peNDF1.18 content was 30.36%, 29.20%, and 27.50% for the T1, T2, and T3 diets, respectively (p<0.05). Dry matter intake was not affected by peNDF content in TMR. Total weight gain in T1 group was significantly higher (p<0.05) than in T2 and T3 groups. However, weight gain did not differ between T2 and T3 groups. The feed conversion ratio decreased with an increase in the peNDF content (T1: 12.18, T2: 14.17, and T3: 14.01 g/g). An increase in the peNDF content of TMR was associated with a linear increase in the digestibility of dry matter, crude protein, crude fiber, neutral detergent fiber, and acid detergent fiber (p<0.05). Also, an increase in peNDF content of the TMR resulted in a linear increase in the number of chews in eating and ruminating (p<0.05), and consequently in the number of total chews (p<0.05). These results indicate that peNDF content affects digestibility and chewing activity. Consequently, the peNDF content of TMR should be considered for improving feed efficiency, digestibility, body weight gain, and performance in fattening heifers.

【 授权许可】

Unknown