Macromineral requirements for maintenance in male and female Saanen goats: A meta-analytical approach

Title
Macromineral requirements for maintenance in male and female Saanen goats: A meta-analytical approach
Publication Date
2020-05
Author(s)
Vargas, Julian Andres Castillo
Almeida, Amelia Katiane
( author )
OrcID: https://orcid.org/0000-0003-3065-0701
Email: adealme2@une.edu.au
UNE Id une-id:adealme2
Souza, Anaiane Pereira
Fernandes, Marcia Helena Machado da Rocha
Harter, Carla Joice
Resende, Kleber Tomas de
Teixeira, Izabelle Auxiliadora Molina de Almeida
Type of document
Journal Article
Language
en
Entity Type
Publication
Publisher
Elsevier BV
Place of publication
Netherlands
DOI
10.1016/j.livsci.2020.104003
UNE publication id
une:1959.11/28792
Abstract
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.
Link
Citation
Livestock Science, v.235, p. 1-7
ISSN
1871-1413
Start page
1
End page
7

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