Caracterização produtiva de espécies de leguminosas forrageiras utilizadas na produção de feno / Productive characterization of species of forage legumes used for hay production

The research was conducted to evaluate the production of fodder legumes used in the production of hay. The experiment was conducted in of Federal University of Piaui in Bom Jesus, Piaui. The design was a randomized blocks with six treatments and three replications. Six forage legumes were used: Macroptillium lathyroides Access 1, Access 2, Access 3, Stylosanthes capitata, Cajanus cajan, Neonotonia wightti. The variables evaluated were: number of plants, green mass of forage production (t ha-1 ) and height. Data were statistically analyzed by Tukey's test at a significance level of 5%. All variables showed differences between the six species of forage legumes (p<0,05). For number of plants per linear meter the S. capitata and N. wightti were higher than 20.00 and 18.00, respectively. The S. capitata and M. lathyroides present better productive characteristics between species.(AU)

Caracterização produtiva de espécies de leguminosas forrageiras utilizadas na produção de feno / Productive characterization of species of forage legumes used for hay production

The research was conducted to evaluate the production of fodder legumes used in the production of hay. The experiment was conducted in of Federal University of Piaui in Bom Jesus, Piaui. The design was a randomized blocks with six treatments and three replications. Six forage legumes were used: Macroptillium lathyroides Access 1, Access 2, Access 3, Stylosanthes capitata, Cajanus cajan, Neonotonia wightti. The variables evaluated were: number of plants, green mass of forage production (t ha-1 ) and height. Data were statistically analyzed by Tukey's test at a significance level of 5%. All variables showed differences between the six species of forage legumes (p<0,05). For number of plants per linear meter the S. capitata and N. wightti were higher than 20.00 and 18.00, respectively. The S. capitata and M. lathyroides present better productive characteristics between species.

Avaliação produtiva e econômica de sistemas de produção bovina em pastagens de capim-elefante / Productive and economic evaluation of cattle production systems on elephant-grass pastures

Avaliou-se o desempenho produtivo de novilhas manejadas em capim-elefante com suplementação alimentar e estudou-se a viabilidade econômica dos sistemas de produção. Utilizaram-se novilhas Holandês-Zebu com idade média de 17 meses e peso médio de 215±8kg, distribuídas nos seguintes sistemas de produção: SP1 - sem suplementação; SP2 - suplementadas com ração concentrada; e SP3 - suplementadas com leguminosa Stylosanthes guianensis, cv. Mineirão. Foram utilizadas 22 novilhas sendo 12 distribuídas nos três sistemas e as demais utilizadas como animais de equilíbrio em função da quantidade de forragem disponível. Os ganhos de peso médio diário foram 429±18g, 624±23g e 535±8g para SP1, SP2 e SP3, e os ganhos de peso diário por área de 2,38; 3,46 e 1,43kg/ha/dia, para SP1, SP2 e SP3, respectivamente. A taxa interna de retorno obtida foi 29,6%, 30,1% e 10,5% para SP1, SP2 e SP3, respectivamente. O preço de venda das novilhas foi o fator de maior impacto no desempenho econômico dos sistemas de produção.(AU)

Productive and economic performance of heifers grazing elephant-grass pastures under different production systems were evaluated. Twenty-two Holstein-Zebu heifers, 17-month-old and averaging 215kg of live weight, were used. The animals were managed on elephant-grass pastures under three production systems: PS1 - without supplementation; PS2 supplemented with concentrate feeds; and PS3 supplemented with Stylosanthes guianensis, cv. Mineirão pasture. Twelve heifers were used as testers and 10 heifers were used as "put-and-take". The average daily gains were 429±18g, 624±23g and 535±8g for animals on PS1, PS2 and PS3, respectively. The total daily gains per hectare were 2.38, 3.46 and 1.43kg, for animals on PS1, PS2 and PS3, respectively. The calculated internal rates of return were 29.6%, 30.1% and 10.5% for PS1, PS2 and PS3, respectively. The sale price of heifers had the largest impact on the economic performance of all production systems.(AU)