How canopy structural and morphological characteristics, and forage chemical composition affect a pasture-based dairy system?

被引:1
|
作者
Rezende, Claudia de Paula [1 ]
Pereira, Jose Marques [2 ]
Magalhaes, Alberti Ferreira [3 ]
Ferreira, Igor Machado [4 ]
Costa Homem, Bruno Grossi [5 ]
Casagrande, Daniel Rume [6 ]
机构
[1] CEPLAC ESSUL, Estagao Expt Pecuaria Extremo Sul Bahia, Anim Sci, Itabela, BA, Brazil
[2] Univ Estadual Santa Cruz, UESC, CEPLAC CEPEC, Dept Agron, Itabuna, BA, Brazil
[3] CEPLAC CEPEC, Anim Sci, Itabuna, BA, Brazil
[4] Univ Estadual Paulista, UNESP, Anim Sci, Campus Jaboticabal, Jaboticabal, SP, Brazil
[5] Empresa Brasileira Pesquisa Agr, EMBRAPA, Anim Sci, Seropedica, RJ, Brazil
[6] Univ Fed Lavras, UFLA, Dept Anim Sci, Lavras, MG, Brazil
来源
SEMINA-CIENCIAS AGRARIAS | 2021年 / 42卷 / 06期
关键词
Cynodon; Forage chemical composition; Grazing management; Megathyrsus; Urochloa; MILK-PRODUCTION; ANIMAL PERFORMANCE; HERBAGE DEPLETION; NUTRITIVE-VALUE; ELEPHANT GRASS; BERMUDAGRASS; STRATEGIES; MOMBACA; HEIGHT; GROWTH;
D O I
10.5433/1679-0359.2021v42n6p3379
中图分类号
S [农业科学];
学科分类号
09 ;
摘要
Pasture-based systems are prevalent among small-scale family farms. Many farmers consider that the nutritional value of the plant is more relevant than the canopy structure. This study aimed to analyze the various factors related to plant structure and chemical composition that most influence milk yield per hectare under rotational stocking. The experiment was performed at the Animal Husbandry Experimental Station of the Extreme South of Bahia. Three rotational stocking systems with three forage species [Cynodon dactylon (L.) Pers. cv. Tifton 85, Urochloa brizantha (Hochst. ex A. Rich.) Stapf. cv. Xaraes, and Megathyrsus maximus Jacq. cv. Mombasa] were evaluated. Nine crossbred Holstein x Gyr cows were allocated to a balanced 3 x 3 Latin square design. The cows were rotated in three pastures every 14 days. The experimental period consisted of seven evaluation cycles of 42 days each. Cluster analysis, principal component analysis (PCA), and multivariate linear regression were the statistical techniques used to evaluate plant structure and morphological characteristics, and animal performance. Xaraes palisadegrass and Mombasa guinea grass were similar for all evaluated characteristics (P> 0.05), whereas Tifton 85 was different from them in terms of structural, morphological, and chemical composition characteristics (P < 0.05). In the PCA, 59.1% of the total variance was explained by components 1 and 2 for the structural and morphological characteristics, and forage chemical composition. Forage structural and morphological variables showed better results in the multivariate linear regression analysis for milk yield per hectare. Structural and morphological characteristics were more correlated with Mombasa guinea grass than Xaraes palisadegrass and Tifton 85. The structural and morphological characteristics of forages were the main factors determining milk yield per hectare in exclusively pasture-based systems with animals of low production.
引用
收藏
页码:3379 / 3397
页数:19
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