Effects of feed restriction on performance, diet digestibility, blood metabolites and slaughter characteristics in fattening Sanjabi male lambs

Authors

1 Head of Agricultural and Natural Resources Research and Education Center of Kermanshah

2 Agricultural and Natural Resources Research and Education Center of Kermanshah

3 Professor of Animal Science Research Institute

4 Head of Nutrition Department of Animal Science Research Institute

Abstract

Background and objectives: Compensatory growth is usually considered as an integral part of studies on feed restriction and there is little information about ruminant’s fattening performance under continuous long term feed restriction (throughout all fattening period), especially in high concentrate diets. The aims of this study were, therefore, to evaluate the effects of quantitative feed restriction on growth performance, serum metabolites concentration, diet chemical components digestibility and the weights of offal components in male Sanjabi lambs.
Materials and methods: This study was conducted based on a completely randomized design, including three treatments and seven replicates using 21 male Sanjabi lambs (90±9 days old; 29.5±3.25 kg). Experimental diet was formulated based on NRC (2007) recommendations. After weaning, lambs were randomly distributed between 3 treatments. Treatments were: 1) ad libitum consumption of diet throughout the fattening period (control); 2) restricted feeding at 90 % of ad libitum intake, and 3) restricted feeding at 80 % of ad libitum intake throughout the fattening period. The amount of feed consumption for each lamb was recorded daily and body weight gain and feed conversion ratio were recorded and calculated triweekly. To Blood samples were collected from jugular vein at days 1, 42 and 84 to measurement serum metabolites concentration. The digestibility of diet’s chemical components was determined using acid-insoluble ash marker. Upon completion of the 84-day recording period, 4 lambs from each treatment were slaughtered and weights of noncarcass components and carcass percentage were measured.
Results: Average daily weight gain decreased significantly and in a linear manner by reduction in feed intake level (P

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Main Subjects

References

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Journal of Ruminant Research
Volume 6, Issue 4
February 2019
Pages 15-30

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