Abstract Concentrated supplementation of ewes is a strategy to increase productivity. The objective was to evaluate the effects of supplementation in the diet of ewes before, during and in the final third of pregnancy and lactation on, the performance and production and composition of colostrum and milk. Forty animals were distributed in a completely randomized design, into the following treatments: CONT = control treatment with mineral salt supplementation only, SSREPRO = supplementation started 20 days before the estrus synchronization (ES) protocol, SSPREG = suplementação a partir da confirmação da gestação (60 days after ES), and SEPREG = supplementation in the third end of pregnancy (90 days after ES). Supplementation adoption changed (P < 0.05) the intake of organic matter, crude protein, neutral detergent fiber, the percentage of total digestible nutrients, and digestibility of dry matter, acid detergent fiber, non-fiber carbohydrates, and ether extract with their respective intake, in addition to colostrum and milk production and composition and animal performance. No difference (P > 0.05) was observed for organic matter, crude protein, and neutral detergent fiber digestibility and total digestible nutrient intake. Thus, supplementation in the final third of pregnancy may result in heavier lambs at weaning, reduction in slaughter time. productivity on design treatments only 2 ES (ES protocol 60 (6 ES, , ES) 90 (9 ES. . P 0.05 005 0 05 matter protein nutrients nonfiber non carbohydrates Thus weaning time 6 ( 9 0.0 00 0.

RESUMO Objetivou-se avaliar o consumo, coeficiente de digestibilidade dos nutrientes, produção e composição química do leite de vacas em lactação mantidas a pasto submetidas à diferentes sistemas alimentares: pasto exclusivo (PE); pasto associado à cana-de-açúcar e ureia a 1% da matéria natural total (PCU); pasto associado a 4 kg dia−1 de suplemento concentrado (PSC); pasto associado à silagem de sorgo e 2 kg dia−1 de suplemento concentrado (PSC), e pasto associado à silagem de sorgo (PSS). O delineamento experimental foi quadrado latino 5×5, constituído de cinco períodos experimentais, com quatorze dias de adaptação e cinco dias de coleta. O consumo matéria seca do pasto, matéria seca total, matéria seca em relação ao peso corporal, fibra em detergente neutro e nutrientes digestiveis totais, não apresentaram efeito (P>0,10) em função dos sistemas alimentares. Constatou-se efeito (P<0,10) sobre o consumo de proteína bruta. No que se refere ao pasto associado ao suplemento concentrado, observou-se o maior consumo 1,50 kg dia−1, todavia, para extrato etéreo o pasto associado à silagem de sorgo e suplemento concentrado 0,19 kg dia−1, carboidrato não fibroso para pasto associado ao suplemento concentrado 2,18 kg dia−1, digestibilidade do extrato etéreo para pasto associado ao suplemento concentrado77,79 kg dia−1, possivelmente pelas variações nutricionais dos suplementos. Portanto nas condições desta pesquisa no tocante ao período primavera-verão, recomenda-se para vacas mestiças holandês x zebu com produção média de 15 kg leite dia−1 o sistema alimentar pasto exclusivo de Urocloa decumbens, pois para a produção e composição química do leite é eventualmente mais viável.

SUMMARY This study aimed to evaluate the intake, digestibility coefficient of nutrients, production and chemical composition of lactating dairy cows on pasture submitted to different feeding systems: exclusive pasture (PE); pasture associated with sugarcane and urea 1% of the total natural matter (PCU); pasture associated with 4 kg day −1 concentrate supplement (PSC); pasture associated with sorghum silage and 2 kg day −1 concentrate supplement (PSC), and pasture associated with sorghum silage (PSS). The experimental design was a Latin square 5 × 5, consisting of five experimental periods, with fourteen days of adaptation and five days of collection. Consuming dry matter pasture, total dry matter, dry matter in relation to body weight, neutral detergent fiber and totals digestible nutrients, showed no effect (P> 0.10) depending on the feeding systems. It was observed effect systems (P <0.10) on the consumption of crude protein pasture associated with for the concentrated supplement was observed higher consumption 1.50 kg day−1, still, extract ethereal or associated to silage sorghum grass and concentrated supplement 0.19 kg day−1, non-fibrous carbohydrate for pasture associated with the concentrated supplement 2.18 kg dia−1, digestibility of ethereal extract for pasture associated with the concentrate supplement77.79 kg day−1, possibly due to nutritional variations of supplements. Therefore under the conditions of this research regarding the spring-summer period, it is recommended for Dutch-zebu crossbred cows with an average production of 15 kg milk day−1, the exclusive pasture system of Urocloa decumbens, since for the production and chemical composition of the milk Is more feasible.