Effects of Different Lengths of Straws on Late Gestation Ewe's Physiological Metabolism and Growth Performance of Their Offspring Lambs

CHANG Xiao; FANG Yi; XIANG Hai; HE Zhixiong; WU Duanqin; ZHONG Rongzhen

doi:10.3969/j.issn.1006-267x.2021.09.031

2021 , Vol. 33 >Issue 9: 5108 - 5118

DOI: https://doi.org/10.3969/j.issn.1006-267x.2021.09.031

RUMINANT AND HERBIVORE NUTRITION AND FEED

Effects of Different Lengths of Straws on Late Gestation Ewe's Physiological Metabolism and Growth Performance of Their Offspring Lambs

CHANG Xiao ,
FANG Yi ,
XIANG Hai ,
HE Zhixiong ,
WU Duanqin ,
ZHONG Rongzhen

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1. Jilin Provincial Key Laboratory of Grassland Farming, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China;
2. College of Advanced Agricultural Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
3. Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China;
4. Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha 410225, China

Received date: 2021-02-24

Online published: 2021-09-18

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Abstract

The aim of this experiment was to study the effects of different lengths of straws on late gestation ewe's feed intake, behavior, rumen fermentation, plasma biochemical indices and birthweight and average daily gain of their offspring lambs. Seventy-two healthy late gestation ewes with the same parity (first), similar body weight[(34.42±2.91) kg] and similar pregnancy days (90 to 95 days) were divided into 3 groups (3 replication per group, 8 ewes per replication, 4 ewes with single lambs and 4 ewes with twin lambs in each replication) and fed with different lengths (1, 2 and 3 cm) of mixed straws (rape straw, wheat straw and soybean pod with the same weight percentages) as roughage formulated total mixed ration (TMR). The diet of concentrate to roughage was 4:6. The experiment concluded 7 days of pre-trial period and 90 days of formal trial period. The results showed as follows:with the straw length increasing, the dry matter intake (P<0.001) in each stage and body weight at lambing day (P=0.033) and 30 d after lambing (P<0.001) of late gestation ewes showed significantly linear increasing trend. Straw length had significant effects on intake, drinking, resting and ruminating time (P<0.001), and the intake and drinking time decreased, whereas the resting and ruminating time increased with the straw length increasing. With the straw length increasing, the rumen fluid total volatile fatty acid (VFA) concentration was significantly decreased (P<0.001), and the pH and ammonia nitrogen concentration were significantly increased (P<0.001), but the acetate:propionate had no significant change (P=0.090). Straw length had significant effects on plasma total protein (TP) (P<0.001), globulin (GLB) (P<0.001), urea nitrogen (UN) (P<0.001) and triglyceride (TG) contents (P<0.001). With the straw length increasing, the plasma TP and GLB contents were increased, the plasma TG content was decreased, and the plasma UN content was firstly decreased and then increased. The birthweight of twin lambs (P<0.001) and the average daily gain of single lambs (P=0.004) and twin lambs (P<0.001) were significantly linearly increased. In conclusion, feeding different lengths of straws affect late gestation ewe's behavior, rumen fermentation, plasma biochemical indices and the birthweight and average daily gain of their offspring lambs. Feeding effects of 2 to 3 cm straw were better than those of 1 cm straw.

Key words： crop straw; cut length; rumen fermentation; lamb growth; pregnant ewes

Cite this article

CHANG Xiao , FANG Yi , XIANG Hai , HE Zhixiong , WU Duanqin , ZHONG Rongzhen . Effects of Different Lengths of Straws on Late Gestation Ewe's Physiological Metabolism and Growth Performance of Their Offspring Lambs[J]. Chinese Journal of Animal Nutrition, 2021 , 33(9) : 5108 -5118 . DOI: 10.3969/j.issn.1006-267x.2021.09.031

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