Performance , carcass quality , and gastric
نویسندگان
چکیده
The growth-promoting effects of two dietary acidifiers based on formic acid were studied with 320 fattening pigs from ca 2 kg to ca 05 kg of body weight. The sorbate-coated formic acid contained formic acid and ammonium formate which were absorbed in diatomaceous earth and coated with potassium sorbate. The investigated liquid blend contained formic and lactic acids as the major components. These acidifiers were added to grower and finisher diets at levels of 3, 6, and 2 g kgof feed. The grower and finisher diets in the negative control treatment contained no growth promoters, but the grower diet in the positive control treatment was supplemented with avilamycin (40 mg kg). The investigated acidifiers did not influence the performance of growing pigs (P > 0.05). In finishing pigs, all additions of the sorbate-coated formic acid improved daily weight gain compared to the negative control (P < 0.05), whereas the feed conversion ratio was improved by additions of 3 and 2 g kgof the acidifier. During the total fattening period, 6 and 2 g kgof the sorbate-coated formic acid improved daily weight gain compared to the situation in the negative control (P < 0.05), and 2 g kgimproved the feed conversion ratio (P < 0.05). The addition of 3 g kgof the blend of formic and lactic acids improved the daily weight gain of the finishing pigs and during the total fattening period, whereas the feed conversion ratio was improved by all the addition levels (P < 0.05). The growth promoting effect of the two acidifiers did not differ significantly, and no significant linear or quadratic trends were found in the pigs’ performance results between the addition levels from 3 to 2 g kg. The
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