RESUMO
This study investigated the effects of phytase inclusion in broiler breeder diets on fecal and egg characteristics. A total of 48 female broiler breeders were evaluated in this study from 21 to 31 weeks of age. The dietary treatments were fed from 30 to 31 wks of age, and included a Positive Control (PosCon) diet, containing 3.0% calcium and 0.50% available phosphorus (AvP); a Negative Control (NegCon) diet, with 3.0% calcium and 0.25% AvP; Negative Control diet + 275 FTU/kg phytase (NegCon+275), and Negative control diet + 550 FTU/kg phytase (NegCon+550). Egg, yolk, albumin, and eggshell weight, albumin height, and eggshell thickness were measured. Fecal parameters included fecal moisture, liquid portion, and mineral content. After 14 d on the experimental diets during the onset of lay, the NegCon+550 diet increased (p 0.01) fecal moisture content. In general, hens fed the highest enzyme level (NegCon+550) excreted fewer (p 0.05) divalent and trivalent cations, which included Al, Fe, Mg, Mn, and Zn. Fecal Na and K levels were not affected by dietary treatments. The NegCon+550 diet increased fecal P when compared with the NegCon and the NegCon+275 diets. The NegCon+550 and PosCon diets exhibited similar fecal P. No significant effects on egg characteristics were observed. It was concluded that during early lay, various signs of fecal changes would probably be observed at phytase dosages above approximately 500 FTU/kg characterized by increased fecal moisture content and excretion of P in broiler breeders.(AU)
Assuntos
Animais , Galinhas/metabolismo , Ração Animal , Óvulo/química , Óvulo/fisiologia , Coliformes/análiseRESUMO
A trial was conducted to determine the effect of phytase (PHY) or a carbohydrase/protease cocktail (CPX) on broilers fed diets with two different levels of chloride (0.28% or 0.43%) created by altering dietary salt (NaCl) and sodium bicarbonate (NaHCO3). There were 6 combination dietary treatments (3 enzyme x 2 NaCl treatments) applied to 4 replicate pens. The treatments were as follows: Control diet (CON), CON+PHY and CON+CPX, with 0.5% or 0.25% NaCl. The 0.25% NaCl versions contained 0.35% sodium bicarbonate. The 0.5% salt versions had no sodium bicarbonate. Replicate pen BW, and feed consumption (FC) were measured at 1, 14, and 35 d, and mortality was weighed daily for feed conversion ratio (FCR) calculations. Feed consumption at 14 d tended to be lower (p 0.10) for CON+CPX diets compared to CON and CON+PHY diets. The birds fed CON+CPX diet consumed less feed but exhibited improved FCR in the presence of 0.5% NaCl at 14 d. The birds fed the CON, and CON+PHY diets exhibited higher BW at 14 d (p 0.05) and 35 d (p 0.01) of age than did CON+CPX birds. From 15 d to 35 d, birds fed the CON+CPX diet exhibited poorer BW gain (BWG) in the presence of 0.25% NaCl (p 0.05). In conclusion, Cl, as NaCl versus NaH2CO3, could affect CPX but not PHY feed enzyme function in broilers. Further, it may be suggested that certain feed enzymes may be best utilized at later broiler ages rather than in initial feeds.(AU)
Assuntos
Animais , Galinhas/crescimento & desenvolvimento , Bicarbonato de Sódio , 6-FitaseRESUMO
This study investigated the effects of phytase inclusion in broiler breeder diets on fecal and egg characteristics. A total of 48 female broiler breeders were evaluated in this study from 21 to 31 weeks of age. The dietary treatments were fed from 30 to 31 wks of age, and included a Positive Control (PosCon) diet, containing 3.0% calcium and 0.50% available phosphorus (AvP); a Negative Control (NegCon) diet, with 3.0% calcium and 0.25% AvP; Negative Control diet + 275 FTU/kg phytase (NegCon+275), and Negative control diet + 550 FTU/kg phytase (NegCon+550). Egg, yolk, albumin, and eggshell weight, albumin height, and eggshell thickness were measured. Fecal parameters included fecal moisture, liquid portion, and mineral content. After 14 d on the experimental diets during the onset of lay, the NegCon+550 diet increased (p 0.01) fecal moisture content. In general, hens fed the highest enzyme level (NegCon+550) excreted fewer (p 0.05) divalent and trivalent cations, which included Al, Fe, Mg, Mn, and Zn. Fecal Na and K levels were not affected by dietary treatments. The NegCon+550 diet increased fecal P when compared with the NegCon and the NegCon+275 diets. The NegCon+550 and PosCon diets exhibited similar fecal P. No significant effects on egg characteristics were observed. It was concluded that during early lay, various signs of fecal changes would probably be observed at phytase dosages above approximately 500 FTU/kg characterized by increased fecal moisture content and excretion of P in broiler breeders.
Assuntos
Animais , Coliformes/análise , Galinhas/metabolismo , Ração Animal , Óvulo/fisiologia , Óvulo/químicaRESUMO
A trial was conducted to determine the effect of phytase (PHY) or a carbohydrase/protease cocktail (CPX) on broilers fed diets with two different levels of chloride (0.28% or 0.43%) created by altering dietary salt (NaCl) and sodium bicarbonate (NaHCO3). There were 6 combination dietary treatments (3 enzyme x 2 NaCl treatments) applied to 4 replicate pens. The treatments were as follows: Control diet (CON), CON+PHY and CON+CPX, with 0.5% or 0.25% NaCl. The 0.25% NaCl versions contained 0.35% sodium bicarbonate. The 0.5% salt versions had no sodium bicarbonate. Replicate pen BW, and feed consumption (FC) were measured at 1, 14, and 35 d, and mortality was weighed daily for feed conversion ratio (FCR) calculations. Feed consumption at 14 d tended to be lower (p 0.10) for CON+CPX diets compared to CON and CON+PHY diets. The birds fed CON+CPX diet consumed less feed but exhibited improved FCR in the presence of 0.5% NaCl at 14 d. The birds fed the CON, and CON+PHY diets exhibited higher BW at 14 d (p 0.05) and 35 d (p 0.01) of age than did CON+CPX birds. From 15 d to 35 d, birds fed the CON+CPX diet exhibited poorer BW gain (BWG) in the presence of 0.25% NaCl (p 0.05). In conclusion, Cl, as NaCl versus NaH2CO3, could affect CPX but not PHY feed enzyme function in broilers. Further, it may be suggested that certain feed enzymes may be best utilized at later broiler ages rather than in initial feeds.