Effects of the ADL/NDF and Length of Ryegrass on Eating Behavior, Ruminal pH and&nbsp; Cellulases Activity in Goats

GAO Yang,XU Ming,LIU Nannan,ZHAO Xianghui,LIU Chanjuan,YAO Junhu

doi:10.3969/j.issn.1006-267x.2011.07.010

Chinese Journal of Animal Nutrition >

2011 , Vol. 23 >Issue 07: 1130 - 1139

DOI: https://doi.org/10.3969/j.issn.1006-267x.2011.07.010

Ruminant Nutrition

Effects of the ADL/NDF and Length of Ryegrass on Eating Behavior, Ruminal pH and Cellulases Activity in Goats

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College of Animal Science and Technology, Northwest A & F University, Yangling 712100, China

Online published: 2011-07-19

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Abstract

The experiment was conducted to study the effects of the ratio of acid detergent lignin to neutral detergent fiber (ADL/NDF) and length of ryegrass on eating behavior, ruminal pH and cellulases activity in goats. Four healthy rumen-cannulated adult goats with the body weight of (40.0±1.8) kg were selected as experimental animals in a two-factor 4×4 latin square design. Factor 1 was the ADL/NDF of ryegrass (low or high), and factor 2 was the chopped length (theoretical length 20 or 5 mm) of ryegrass. The results showed as follows: 1) The physically effective NDF (peNDF) contents in 8.00 and 1.18 mm layers of the roughages made of ryegrass at full-bloom stage were significantly higher than that at early-bloom stage (P<0.05); with the increasing of ryegrass length, the contents of dry matter (DM) in the layers＞8.00 mm and physically effective factor (pef) and peNDF in 8.00 and 1.18 mm layers of the roughages, as well as the contents of DM in the layers＞8.00 mm and pef and peNDF in 8.00 mm layer of the diets were all significantly increased (P<0.05). 2) With the increasing of ryegrass length, the dry matter intake (DMI) and foraging time significantly decreased, but the chewing and rumination time significantly increased (P<0.05); with the increasing of ryegrass ADL/NDF and length, the means of ruminal pH increased (P≤0.05), and the duration time of pH<6.0 significantly shortened (P<0.05). 3) The activities of ruminal crystal cellulose hydrolytic enzyme at 12 and 16 h, salicin hydrolytic enzyme at 4 h and xylanase at 8 h after feeding in the morning were all significantly increased by high ADL/NDF of ryegrass (P<0.05); with the increasing of ryegrass length, the activities of the ruminal crystal cellulose hydrolytic enzyme at 8 and 16 h, CMC hydrolytic enzyme at 8 h and salicin hydrolytic enzyme at 4 h after feeding in the morning all significantly increased, but the CMC hydrolytic enzyme at 16 h after feeding significantly decreased (P<0.05). These results indicate that with the increasing of ADL/NDF and length of ryegrass, eating behaviour and ruminal pH can be significantly improved, and DMI can be significantly decreased and the activities of celluloses in rumen at some time points can be significantly increased. ［Chinese Journal of Animal Nutrition, 2011, 23（7）：1130 -1139］

Key words： goats; ryegrass; length; neutral detergent fiber; ruminal pH; ; cellulase

Cite this article

GAO Yang,XU Ming,LIU Nannan,ZHAO Xianghui,LIU Chanjuan,YAO Junhu . Effects of the ADL/NDF and Length of Ryegrass on Eating Behavior, Ruminal pH and Cellulases Activity in Goats[J]. Chinese Journal of Animal Nutrition, 2011 , 23(07) : 1130 -1139 . DOI: 10.3969/j.issn.1006-267x.2011.07.010

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