Valor nutritivo de alguns alimentos para rãs

Abstract

RESUMO -O objetivo deste trabalho foi determinar o valor nutritivo de alguns alimentos utilizados em rações de rãs, em um ensaio de digestibilidade, utilizando-se o método de alimentação forçada, com 84 rãs na fase de terminação (128,5 g ± 2 g) e 120 rãs na fase inicial (27,3 g ± 2 g), distribuídas em gaiolas de metabolismo. Quarenta rãs na fase inicial e 28 na fase de terminação permaneceram de jejum, para determinar as perdas endógenas e metabólicas. Os valores de matéria seca aparentemente metabolizável (MSAM -%), energia metabolizável aparente (EMA -kcal/kg), energia metabolizável aparente corrigida pela retenção de nitrogênio (EMAn -kcal/kg), energia metabolizável verdadeira (EMV -kcal/kg) e energia metabolizável verdadeira corrigida pela retenção de nitrogênio (EMVn -kcal/kg) determinados para os diferentes ingredientes, com rãs na fase inicial foram, respectivamente: fubá de milho 55,70; 1842; 1798; 1948 Nutritive Values of Some Frog FeedsABSTRACT -The objective of this study was to determine the nutritive values of some feeds from frogs diets, in a digestibility assay, using the forced feeding method, with 84 frogs at finishing stage (128,5 g ± 2 g) and 120 at initial stage (27,3 g ± 2 g), housed in metabolism cages. Forty frogs at initial stage and 28 at finishing stage were fasting, to determine the endogenous and metabolic losses. The values of apparent metabolizable dry matter (AMDM -%), apparent metabolizable energy (AME -kcal/kg), apparent metabolizable energy corrected by the nitrogen retention (AMEn -kcal/kg), true metabolizable energy (TME -kcal/kg) and true metabolizable energy corrected by the nitrogen retention (TMEn -kcal/kg) determined for the different ingredients, with frogs at the initial stage were: corn meal 55.70; 1842; 1798; 1948 and 1896; corn starch 49.60; 1553; 1524; 1634 and 1599; wheat meal 35.95; 1192; 1097; 1361 and 1256; soybean meal 76.97; 2856; 2405; 2965 and 2508; fish meal 55.16; 2288; 1915; 2386 and 1995 and meat and bone meal 29.63; 1683; 1418; 1765 and 1495, respectively. The values of AMDM (%), AME (kcal/kg), AMEn (kcal/kg), TME (kcal/kg) and TMEn (kcal/kg) determined withy frog at the finishing stage, for the different ingredients, were,: corn meal 58. 44; 1934; 1893; 1971 and 1827; corn starch 73.03; 2132; 2085; 2175 and 2007; wheat meal 87.54; 2800; 2644; 2838 and 2602; soybean meal 71.50; 2718; 2284; 2754 and 2220; fish meal 60.24; 2266; 1817; 2347 and 1672 and meat and bone meal 59.01; 2080; 1835; 2113 and 1797, respectively IntroduçãoConsiderando a importância de se estabelecer um programa de alimentação para as espécies em cultivo, como é o caso da rã-touro, torna-se necessário conhecer sua biologia para se chegar a um manejo mais adequado e fornecer uma alimentação mais ajustada às exigências do animal, para assegurar o menor custo de produção, que, no caso específico da rã, a ração corresponde a 57,1% do custo total de Rev. bras. zootec., 30(3):605-610, 2001 produção (LIMA e AGOSTINHO, 1992).A rã touro, assim como todos os anfíbios, é carnívora na fas...

Digestibility of nutrients and energy in ingredients for bullfrogs during different phases of development

“…Castro et al (1998Castro et al ( , 2001 observed higher apparent metabolizable energy values of soybean meal (2,780 and 2,718 kcal/kg, respectively) for bullfrogs during the finishing phase when compared to the digestible energy (2,054.4 cal/g) obtained in the present study for the same phase of development. Probably these authors obtained different values because they used other faeces collection methods.4.3 | Apparent digestibility coefficients of crude protein (ADC CP ), gross energy (ADC GE ) and ether extract (ADC EE ) in plant energy ingredientsCorn and wheat bran exhibited low digestibility coefficients of protein and energy during the different phases of bullfrog development (Table…”

“…After the period of adaptation (one week receiving the reference diet), the animals were fasted for 48 hr to empty the digestive tube. Next, the animals were submitted to force‐feeding with 5% of the test diet in relation to their live weight (Braga et al., ; Castro et al., , ).…”

“…Next, the animals were submitted to force-feeding with 5% of the test diet in relation to their live weight (Braga et al, 1998;Castro et al, 1998Castro et al, , 2001.…”

“…The ability of frogs to digest nutrients is believed to change with the growth of the animal (Braga et al, 1998;Castro et al, 2001).…”

“…The ability of frogs to digest nutrients is believed to change with the growth of the animal (Braga et al., ; Castro et al., ). Another uninvestigated factor is the effect of physiological maturation on the ability to digest and absorb nutrients.…”