Ameliorative Effect of Zinc and Multistrain Probiotic on Muscle and Bone Characteristics in Broiler Reared under Cyclic Heat Stress
Ameliorative Effect of Zinc and Multistrain Probiotic on Muscle and Bone Characteristics in Broiler Reared under Cyclic Heat Stress
Muqader Shah1,*, Hafsa Zaneb2, Saima Masood2, Rifat Ullah Khan1, Salahud Din1, Shakirullah3, Imad Khan2, Ambrina Tariq4 and Habib ur Rehman5
ABSTRACT
From day 22, a total of 280 day-old broiler chicks were allotted to seven groups with five replicates till 42 days. The groups were designated as T1, thermoneutral zone; T2, heat stressed (HS); T3, HS + zinc (Zn) supplementation (30 mg/kg); T4, HS + Zn (60 mg/kg); T5, HS + probiotic; T6, HS + probiotic + Zn (30 mg/kg); T7, HS+ Zn (60 mg/kg) + probiotic. The results revealed that muscle pH, muscle fiber diameter (MFD) and muscle fiber cross sectional area (MFCSA) were significantly (P<0.05) higher in T2 compared to all other treatments under HS. Drip losses was significantly (P<0.01) lower in the treatment groups compared to T2. Muscle fascicle diameter (MFSD) and muscle fascicle cross sectional area (MFSCSA) were significantly (P<0.01) lower in T2 and T3 while higher (P<0.01) in all other treatments under HS condition. Muscle fiber number (MFN) was significantly (P<0.05) higher in T2, T5 and T7 compared to the control. Wall thickness, diameter and medial canal diameter increased significantly (P<0.01) in T6. However, tibiotarsal index decreased significantly (P<0.01) in T5. In conclusion, Zn and probiotic ameliorated the negative effect of HS. However, the bone parameters were not greatly affected by HS and the supplements.
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