Pasture structure and production of supplemented cattle in deferred signalgrass pasture

Santos, Anselmo de Deus; Fonseca, Dilermando Miranda da; Sousa, Braulio Maia de Lana; Santos, Manoel Eduardo Rozalino; Carvalho, Angélica Nunes de

doi:10.1590/1809-6891v21e-43578

Acessibilidade / Reportar erro

Brasil

Ciência Animal Brasileira

Español English

Brasil

Español English

sumário « anterior atual seguinte »

Sumário

Zootecnia • Ciênc. anim. bras. 21 • 2020 • https://doi.org/10.1590/1809-6891v21e-43578 copy

Pasture structure and production of supplemented cattle in deferred signalgrass pasture

Estrutura do pasto e produção de bovinos suplementados em pastagens diferidas com capim braquiária

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

The effects of supplement doses (0, 1, 2 and 3 kg ha^-1 day^-1) and grazing periods (1, 28, 59, 89 and 103 days) on the B. decumbens cv. Basilisk structure and cattle production in deferred pastures were evaluated. The design was a randomised complete block design with two replications. The sward height and the total forage and stem masses decreased with grazing period. The crude protein (8.12%) and in vitro organic matter digestibility (52.74%) were not affected by grazing period. The fibre content in neutral and acid detergent increased linearly with the grazing period. The average daily gain of cattle ranged from 0.419 to 1.019 kg animal^-1 day^-1; the stocking rate ranged from 2.7 to 3.9 animal unit ha^-1; and the average gain per area ranged from 2.7 to 7.9 kg ha^-1 day^-1, with the maximum values obtained with the highest dose of concentrate. Concentrate supplementation increases cattle production in deferred pastures. During the use of deferred pasture in winter there are decreases in the quantity and quality of forage, as well as limitations in its structure.

Keywords:
Brachiaria decumbens; Ecophysiology; Grazing management

Variable	Equation	R²	CV^a a Coefficient of variation for the level of supplement factor; (%)	CV^b b Coefficient of variation for grazing period factor; (%)
PH (cm)	$\hat{Y} = 39.48 - 3.9150 * S + 1.0750 * S^{2} - 0.2115 * P$	0.90	56.09	5.90
PEH (cm)	$\hat{Y} = 50.24 - 5.5540 * S + 1.8440 * S^{2} - 0.2321 * P$	0.83	55.98	6.69
FI	$\begin{matrix} \hat{Y} = 1.21 + 0.006722 * P - 0.00004979 * P^{2} + \\ 0.0005297 * SP \end{matrix}$	0.81	26.44	5.85

Variable	Equation	R²	CV^a (%)	CV^b (%)
TFM (kg ha^-1)	$\hat{Y} = 9, 114.8 - 48.7895 * P$	0.49		21.50
LLBM (kg ha^-1)	$\begin{matrix} \hat{Y} = 2, 773, 0 - 320.765 * S + \\ 104.109 * S^{2} - 56.5370 * P + \\ 0.314937 * P^{2} \end{matrix}$	0.90	26.01	21.76
LSM (kg ha^-1)	$\hat{Y} = 4.110, 5 - 28.4882 * P$	0.63		33.85
VDLLB (kg ha^-1 cm^-1)	$\begin{matrix} \hat{Y} = 74.60 - 1.20159 * P + \\ 0.0053124 * P^{2} \end{matrix}$	0.87		20.18
TPD (tiller m^-2)	$\begin{matrix} \hat{Y} = 1, 521.05 + 74.9332 * S - \\ 5.83774 * P \end{matrix}$	0.60	45.85	21.63

Variable	Equation	R²	CV^a a Coefficient of variation for the supplement level factor; (%)	CV^b b Coefficient of variation for grazing period factor; (%)
LS	$\hat{Y} = 31.59 - 0.66722 * P + 0.00393 * P^{2}$	0.93	43.39	18.62
DLB	$\hat{Y} = 46.34 - 0.161774 * P$	0.55	29.70	22.46
DS	$\begin{matrix} \hat{Y} = 12.23 - 4.29825 * S + 1.39325 * S^{2} + 0.37265 * P \\ + 0.00322 * P^{2} \end{matrix}$	0.47	26.12	15.83
LLB	$\hat{Y} = 15.06 - 1.8040 * S + 0.381112 * P$	0.83	75.81	22.13

Variable	Equation	R²	CV^a a Coefficient of variation for the supplement level factor; (%)	CV^b b Coefficient of variation for grazing period factor; (%)
LLB (%)	$\begin{matrix} \hat{Y} = 72.07 - 1.665 * P + 0.0118 * P^{2} + \\ 2.881 * S \end{matrix}$	0.73	30.41	17.03
FD (%)	$\hat{Y} = 10.02 + 1.339 * P - 0.0087 * P^{2}$	0.50	34.42	12.08

Variavel	Equation	R²	CV^a (%)	CV^b (%)
NDF	$\hat{Y} = 69.91 + 0.06412 * P$	0.63	2.58	2.70
ADF	$\hat{Y} = 31.13 + 0.0789 * P$	0.51	8.52	7.45
LIG	$\hat{Y} = 3.33 + 0.0239 * P$	0.54	15.57	9.27
CEL	$\hat{Y} = 20.89 + 0.05884 * P$	0.54	12.28	7.41
SIL	$\hat{Y} = 1.14 + 0.02217 * P$	0.55	26.59	26.31

Item	Equation	R²	CV (%)
ADG (kg animal^-1 dia^-1)	$\hat{Y} = 0.419 + 0.2002 * S$	0.94	5.85
SR (UA ha^-1)	$\hat{Y} = 2.733 + 0.42075 * S$	0.98	9.48
LPA (kg ha^-1)	$\hat{Y} = 2.720 + 1.7216 * S$	0.97	7.26
RSI (kg animal^-1 dia^-1)	$\hat{Y} = 0.022 + 0.96450 * S$	0.99	3.93
ASI (kg animal^-1 dia^-1)	$\hat{Y} = 0.054 + 0.40925 * S$	0.97	4.58
OFFER (% of body weight)	$\begin{matrix} \hat{Y} = 18.905 - \\ 2.83325 * S \end{matrix}$	0.04	17.58

Universidade Federal de Goiás Universidade Federal de Goiás, Escola de Veterinária e Zootecnia, Campus II, Caixa Postal 131, CEP: 74001-970, Tel.: (55 62) 3521-1568, Fax: (55 62) 3521-1566 - Goiânia - GO - Brazil
E-mail: revistacab@gmail.com

Acompanhe os números deste periódico no seu leitor de RSS

[1] *Correspondent - manoel.rozalino@ufu.br