104,5, 99,9,99,7 et 9'7,7 kg et 192,1, 177,2, 181,5 et 179,9 jours. En outre, la glande pin6ale 6tait plus lourde (P<0,05) chez les truies log6es sous 6clairage ir la lumibre rouge, ce qui semblerait sugg6rer une association entre le poids plus 6lev6 de cette glande et le retard de la pubert6. En plus, les bdtes plus Ag6es semblaient avoir des glandes pin6ales plus lourdes, ind6pendamment du traitement d'6clairement. Le r6gime d'6clairement n'a pas donn6 lieu i des effets significatifs pour ce qui est du Gain moyen quotidien ou de I'indice de consommation. Quand 0008-3984/82/6202-O4t'7 $2.00
A 3 x 2 factorial floor pen experiment was conducted to determine the effects of feeding salinomycin (60 ppm) or maduramicin (5 ppm) for 49 days followed by a 3-day withdrawal ration upon both male and female broiler chickens in a coccidia-free environment. Body weights, feed intake, and water consumption were recorded at 28, 49, and 52 days of age. Feed efficiency and overall mortalities were also measured. Inclusion of either ionophore into the ration had no effect on final body weight, but improved feed conversion (P less than .05). Birds fed maduramicin drank more than the nonmedicated birds (P less than .05), which in turn, drank more than the birds fed salinomycin (P less than .05).
Two, 7-week floor pen experiments were conducted consecutively with male broilers and then female broilers to determine the effects of feeding salinomycin (60 ppm), monensin (99 ppm), or lasalocid (125 ppm) at the following three levels of dietary protein: 1) that which meets National Research Council specifications (NRC, 1977), 2) that level deficient in sulfur amino acids (SAA), or 3) that deficient in protein. Group body weights, feed intake, and water consumption were noted at 28 and 49 days of age with feed efficiency and overall mortalities determined. Reducing SAA resulted in depressed (P less than .05) body weights at 7 weeks in both experiments, whereas deficient protein reduced (P less than .05) growth, feed efficiency, and water consumption. Generally, inclusion of coccidiostats in the diet did not significantly hinder growth or feed efficiency. Feeding of coccidiostats in combination with the low protein diet did not produce additional anorexigenic effects. Although a significant lasalocid SAA-sparing effect was not observed, diet X coccidiostat interactions (P less than .05) were apparent and attributable to an apparent "protein-sparing" effect upon body weight gain when salinomycin was fed in combination with the low protein diet. Lasalocid increased water consumption (P less than .05) relative to monensin in the female broilers.
A floor pen trial using an in-feed coccidia model was conducted to determine the efficacy of salinomycin at the rate of 60 mg/kg of feed and to ascertain any interference of lincomycin at 2.2 mglkg upon salinomycin efficacy in broiler chickens.
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