de Sousa Sheila Vilarindo, de Araújo Marcos Jácome, E Silva Tairon Panunzio Dias, Marques Carlo Aldrovandi Torreão, da Costa Torreão Jacira Neves, Bezerra Leilson Rocha, de Sousa Lima Isak Samir, Gottardi Fernanda Patrícia
Programa de Pós-Graduação em Zootecnia, Universidade Federal do Piauí, Campus Professora Cinobelina Elvas, Bom Jesus, PI, Brazil.
Colégio Técnico de Bom Jesus, Universidade Federal do Piauí, Bom Jesus, PI, Brazil.
Trop Anim Health Prod. 2018 Dec;50(8):1903-1912. doi: 10.1007/s11250-018-1643-2. Epub 2018 Jun 22.
The aim of this study was to evaluate the impact of different levels of dietary supplementation and reproductive stages on dry matter intake, digestibility, milk production, and mineral metabolism in Santa Inês hair ewes. Two dietary supplement levels of 0.5 and 1.5%, based on body weight, were used. A total of 12 hair ewes (six subjected to 0.5 and six subjected to 1.5% of concentrate supplementation based on body weight-BW) of the Santa Inês breed were evaluated in a completely randomized design with fixed effects of supplementation level, period, and its interactions. Dry matter intake, digestibility, milk production, and mineral metabolism (calcium (Ca), phosphorus (P), magnesium (Mg), alkaline phosphatase (ALP), type I insulin-like growth factor (IGF-I), parathyroid hormone (PTH), and osteocalcin (OC)) were assessed. Dry matter digestibility was affected by the supplementation level (during both pregnancy and lactation), with higher values in ewes fed at a level of 1.5% of BW. A significant interaction between treatment × reproductive stages was found for the Mg concentration. A period effect (P < 0.05) on serum concentrations of P, Ca/P, Mg, and IGF-I was observed. Serum P concentrations were influenced (P < 0.05) by treatments and reproductive stages. There were significant differences in the Ca/P ratio among the reproductive stages. The enzymatic activity of ALP and serum IGFI differed among reproductive stages. Ewes supplemented at a level of 1.5% of BW produced 18.5% more milk than ewes supplemented at a level of 0.5% of BW. The use of 0.5% of body weight in concentrate supplementation is recommended for the reduction of production costs, without having an effect on the mineral metabolism of Santa Inês hair ewes.
本研究的目的是评估不同水平的日粮补充和繁殖阶段对圣伊内斯毛用母羊干物质采食量、消化率、产奶量和矿物质代谢的影响。采用了基于体重的两种日粮补充水平，分别为0.5%和1.5%。总共12只圣伊内斯品种的毛用母羊（6只接受基于体重（BW）的0.5%精料补充，6只接受1.5%精料补充），采用完全随机设计，评估补充水平、时期及其交互作用的固定效应。评估了干物质采食量、消化率、产奶量和矿物质代谢（钙（Ca）、磷（P）、镁（Mg）、碱性磷酸酶（ALP）、I型胰岛素样生长因子（IGF-I）、甲状旁腺激素（PTH）和骨钙素（OC））。干物质消化率受补充水平影响（在妊娠和泌乳期间均如此），体重1.5%水平补饲的母羊干物质消化率更高。发现Mg浓度在处理×繁殖阶段之间存在显著交互作用。观察到时期对血清P、Ca/P、Mg和IGF-I浓度有影响（P < 0.05）。血清P浓度受处理和繁殖阶段影响（P < 0.05）。繁殖阶段之间的Ca/P比值存在显著差异。ALP的酶活性和血清IGFI在繁殖阶段之间有所不同。体重1.5%水平补饲的母羊产奶量比体重0.5%水平补饲的母羊多18.5%。建议使用体重0.5%的精料补充量以降低生产成本，且不会对圣伊内斯毛用母羊的矿物质代谢产生影响。
