Effect of increasing levels of white mulberry leaves (<Emphasis Type="Italic">Morus alba</Emphasis>) on ruminal dry matter degradability in lambs |
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Authors: | Jaime Salinas-Chavira Omar Castillo-Martínez J Efren Ramirez-Bribiesca Miguel Mellado |
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Institution: | 1.Facultad de Medicina Veterinaria y Zootecnia,Universidad Autónoma de Tamaulipas,Ciudad Victoria,Mexico;2.Colegio de Posgraduados,Texcoco,Mexico;3.Departamento de Nutrición Animal,Universidad Autónoma Agraria Antonio Narro,Saltillo,Mexico |
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Abstract: | A study was conducted to estimate dry matter (DM) degradability in the rumen of lambs offered a basal soybean meal and sorghum
grain diet with three levels of white mulberry (WM) leaves (Morus alba). Diets consisted of 90% concentrate and 10% sorghum straw, which was incrementally replaced by WM leaves at 0% (control
diet, T1), 2.5% (T2), and 5% (T3) of the total ration. Crude protein (CP) in WM was 21.8% (DM basis). Diets had equal CP (14%
DM basis) and metabolizable energy (10.8 MJ/kg DM) content. Three non-castrated Pelibuey male lambs fitted with permanent
rumen cannula were utilized in a 3 × 3 Latin square design. Each experimental period consisted of 10 days of adaptation followed
by sampling. DM degradability was determined using the nylon bag technique. Bags contained the experimental diets offered
in each period and were incubated in rumen in pairs for 4, 8, 12, 24, and 48 h. The potential degradation was higher (P < 0.05) for T2, followed by T3 and T1. WM level did not influence the degradation rate or the effective degradation at the
three passage rates modeled. It was concluded that WM forage may have useful application in feedlot diets for growing lambs,
as this forage increases potential degradation of high-grain diets. The incorporation of WM in diets for feedlot lambs in
tropics may reduce the use of expensive conventional protein supplements. |
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