Effect of Oscillating Protein Feeding on Feed Intake, Digestibility, and Nitrogen Balance in Moghani Male Lambs
محورهای موضوعی :
T. Yalchi
1
,
B. Barzegar
2
,
V. Vahedi
3
1 - Department of Animal Sciences, Faculty of Agriculture and Natural Resources Moghan, University of Mohaghegh Ardabili, Ardabil, Iran
2 - Department of Animal Sciences, Faculty of Agriculture and Natural Resources Moghan, University of Mohaghegh Ardabili, Ardabil, Iran
3 - Department of Animal Sciences, Faculty of Agriculture and Natural Resources Moghan, University of Mohaghegh Ardabili, Ardabil, Iran
کلید واژه: daily weight gain, feed conversion ratio, nitrogen efficiency, nitrogen retention, sheep,
چکیده مقاله :
This study aimed to investigate the effect of oscillating crude protein (CP) levels in the diet, combined with a reduction in protein levels, on feed intake, nutrient digestibility, and nitrogen balance in Moghani lambs. A total of eight male lambs were used in a 4 × 4 Latin square design. The experimental treatments included: 1) a diet containing 15% CP with a constant intake (control); 2) diets containing 13% and 17% CP; 3) diets containing 12% and 16% CP and 4) diets containing 11% and 15% CP with a 48-hour oscillating intake cycle. Feed intake, daily weight gain, and feed conversion ratio showed no significant differences among the experimental treatments. Linear comparisons of the treatments with reduced CP levels also revealed no significant differences in feed conversion ratio. Dry matter and organic matter digestibility did not differ significantly between treatments; however, the treatment with oscillating CP levels of 13% and 17% exhib-ited the highest crude protein digestibility. Fecal and urinary nitrogen excretion did not significantly differ among treatments, but linear comparison of the oscillating CP treatments indicated that decreasing dietary CP levels significantly reduced nitrogen excretion via feces and urine. The highest retained nitrogen and nitrogen efficiency were observed in the treatment with oscillating CP levels of 13% and 17%, which showed a significant difference compared to the constant 15% CP diet. Overall, the results indicated that oscillating CP levels in the diet improved crude protein digestibility and increased nitrogen retention and efficiency in male lambs, while having no significant effect on feed intake, feed conversion ratio, or daily weight gain. Additionally, the absence of significant differences in performance traits among treatments with reduced CP levels highlights the beneficial effects of oscillating protein feeding.
This study aimed to investigate the effect of oscillating crude protein (CP) levels in the diet, combined with a reduction in protein levels, on feed intake, nutrient digestibility, and nitrogen balance in Moghani lambs. A total of eight male lambs were used in a 4 × 4 Latin square design. The experimental treatments included: 1) a diet containing 15% CP with a constant intake (control); 2) diets containing 13% and 17% CP; 3) diets containing 12% and 16% CP and 4) diets containing 11% and 15% CP with a 48-hour oscillating intake cycle. Feed intake, daily weight gain, and feed conversion ratio showed no significant differences among the experimental treatments. Linear comparisons of the treatments with reduced CP levels also revealed no significant differences in feed conversion ratio. Dry matter and organic matter digestibility did not differ significantly between treatments; however, the treatment with oscillating CP levels of 13% and 17% exhib-ited the highest crude protein digestibility. Fecal and urinary nitrogen excretion did not significantly differ among treatments, but linear comparison of the oscillating CP treatments indicated that decreasing dietary CP levels significantly reduced nitrogen excretion via feces and urine. The highest retained nitrogen and nitrogen efficiency were observed in the treatment with oscillating CP levels of 13% and 17%, which showed a significant difference compared to the constant 15% CP diet. Overall, the results indicated that oscillating CP levels in the diet improved crude protein digestibility and increased nitrogen retention and efficiency in male lambs, while having no significant effect on feed intake, feed conversion ratio, or daily weight gain. Additionally, the absence of significant differences in performance traits among treatments with reduced CP levels highlights the beneficial effects of oscillating protein feeding.
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