Exigências líquidas de macrominerais para crescimento em cabritos Saanen de diferentes sexos
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Data
2013-07-30
Autores
Mendonça, Alana Nunes [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
A existência de grandes divergências nas pesquisas referentes a macrominerais corroboram com a necessidade de mais estudos que avaliem as exigências de minerais, e em caprinos em crescimento esta necessidade torna-se ainda mais veemente, desta forma tem-se por objetivo determinar as exigências de cálcio (Ca), fósforo (P), magnésio (Mg), sódio (Na) e potássio (K) para ganho em peso em cabritos Saanen de diferentes sexos, utilizando a técnica do abate comparativo. Foram utilizados 48 animais da raça Saanen, sendo 18 fêmeas, 18 machos inteiros e 12 machos castrados com o peso corporal (PC) variando de 5 a 15 kg. Para a determinação da composição corporal foi utilizado o método direto, aplicando a equação alométrica logaritimizada (Log y = a + b Log x), e para a estimativa das exigências foi realizado o método de abate comparativo. O delineamento experimental utilizando foi o inteiramente casualizado em esquema fatorial 3 x 3 que incluiu três pesos para o abate (5, 10 e 15 kg) e três condições sexuais (fêmeas, machos inteiros e machos castrados). Os dados foram analisados como modelos mistos, utilizando-se o procedimento MIXED do pacote estatístico SAS. As equações para a estimativa da composição corporal em Ca e Mg foram diferentes para fêmeas comparada aos machos e castrados. As exigências líquidas de macrominerais para ganho em peso de Ca e Mg foram menores para as fêmeas. Em geral, a exigência dos minerais aumentou com o aumento de peso corporal. No período de 5 a 15kg de peso corporal, os machos inteiros e castrados apresentam maiores exigências em Ca e Mg comparado com as fêmeas
Divergences in the studies on macrominerals corroborate the need for further studies to assess mineral requirements of growing goats, especially evaluating the effect of gender on it. The objective was to determine calcium (Ca), phosphorus (P), magnesium (Mg), sodium (Na) and potassium (K) requirements for body weight gain of Saanen goat kids, using the comparative slaughter technique. A total of 48 Saanen goat kids, 18 doelings, 18 male and 12 male castrates with body weight (BW) ranging from 5 to 15 kg were used. At the beginning of the experiment six males and six females were slaughted (BW = 5?? ± ??) kg body weight, castrated males were not slaughtered at 5,0 kg BW, because the castration occurred at about 15 days old, approximately the same age in which anials reached 5 kg BW, then the male goat kids slaughtered at 5 kg BW were considered to develop the equations of castrated and intact male goat kids. The rest of the kids of each gender were randomly assigned to two treatment groups (slaughter weight, around 10 and 15 kg BW). The experiment was conducted using a completely randomized design in a factorial arrangement 3 x 3 (slaughter weight and gender) and the data were analyzed using PROC MIXED. Body composition was estimated using the allometric equation (Log y = a b log x). The equations for estimating body composition in Ca, Mg and Na were different for the gender studied. Net Ca and Mg requirements for gain were lower for females, while intact and castrated males presented higher sodium requirement. We did not find differences on P and K net requirements for gain between gender
Divergences in the studies on macrominerals corroborate the need for further studies to assess mineral requirements of growing goats, especially evaluating the effect of gender on it. The objective was to determine calcium (Ca), phosphorus (P), magnesium (Mg), sodium (Na) and potassium (K) requirements for body weight gain of Saanen goat kids, using the comparative slaughter technique. A total of 48 Saanen goat kids, 18 doelings, 18 male and 12 male castrates with body weight (BW) ranging from 5 to 15 kg were used. At the beginning of the experiment six males and six females were slaughted (BW = 5?? ± ??) kg body weight, castrated males were not slaughtered at 5,0 kg BW, because the castration occurred at about 15 days old, approximately the same age in which anials reached 5 kg BW, then the male goat kids slaughtered at 5 kg BW were considered to develop the equations of castrated and intact male goat kids. The rest of the kids of each gender were randomly assigned to two treatment groups (slaughter weight, around 10 and 15 kg BW). The experiment was conducted using a completely randomized design in a factorial arrangement 3 x 3 (slaughter weight and gender) and the data were analyzed using PROC MIXED. Body composition was estimated using the allometric equation (Log y = a b log x). The equations for estimating body composition in Ca, Mg and Na were different for the gender studied. Net Ca and Mg requirements for gain were lower for females, while intact and castrated males presented higher sodium requirement. We did not find differences on P and K net requirements for gain between gender
Descrição
Palavras-chave
Caprino, Caprino - Crescimento, Corpo - Composição, Minerais na nutrição animal, Corpo - Peso, Body composition
Como citar
MENDONÇA, Alana Nunes. Exigências líquidas de macrominerais para crescimento em cabritos Saanen de diferentes sexos. 2013. vi, 40 p. Dissertação (mestrado) - Universidade Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias de Jaboticabal, 2013.