Autor(es):
Vargas, Julián Andrés Castillo [UNESP] ; Almeida, Amélia Katiane [UNESP] ; Souza, Anaiane Pereira [UNESP] ; Fernandes, Márcia Helena Machado da Rocha [UNESP] ; Härter, Carla Joice [UNESP] ; de Resende, Kléber Tomás [UNESP] ; Teixeira, Izabelle Auxiliadora Molina de Almeida [UNESP]
Data: 2020
Identificador Persistente: http://hdl.handle.net/11449/201646
Origem: Oasisbr
Assunto(s): Comparative slaughter; Dairy goat; Meta-analysis; Mineral requirement; Sex; Comparative slaughter; Comparative slaughter; Dairy goat; Dairy goat; Meta-analysis; Meta-analysis; Mineral requirement; Mineral requirement; Sex; Sex
Descrição
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Asociación Universitaria Iberoamericana de Postgrado
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
The objective of this study was to evaluate the effects of sex on the daily net requirements of calcium (NCam), phosphorus (NPm), potassium (NKm), and magnesium (NMgm) for maintenance in Saanen goats from 5 to 45 kg BW. Two datasets were used: the first dataset was composed of 154 individual records (53 castrated males, 46 females, and 55 intact males) from three studies, and was used to estimate the NCam, NPm, NKm, and NMgm using the comparative slaughter technique (CST). The second dataset was assembled from 160 individual records (67 castrated males, 45 females, and 48 intact males) from four feeding trials, and was used to estimate the NCam, NKm, and NMgm in Saanen goats, using the minimum endogenous losses method (MEL). A meta-analytic approach was applied using a mixed model, in which sex was considered a fixed effect and study a random effect. Using the CST, the results revealed that sex did not affect NCam, NPm, or NKm (21.1, 22.8, and 4.0 mg/kg BW, respectively; P > 0.10), but NMgm of intact males was greater than for castrated males or females (2.6 versus 1.4 mg/kg BW; P = 0.077). On the other hand, sex did not affect the NCam, NKm, or NMgm (38.0, 25.2, and 7.4 mg/kg BW, respectively; P > 0.10), when MEL was used. The findings of this study suggest that Ca, P, and K requirements for maintenance in goats are not influenced by sex. Conversely, Mg requirement for maintenance should be discriminated by sex. Also, that P requirements for maintenance were significantly lower than current feeding system recommendations.
Department of Animal Science UNESP - Universidade Estadual Paulista
School of Environmental and Rural Science University of New England
Department of Animal Science UNESP - Universidade Estadual Paulista
Asociación Universitaria Iberoamericana de Postgrado: 1
Asociación Universitaria Iberoamericana de Postgrado: 166754
FAPESP: 2014/14734
FAPESP: 9
