The objective of this study was to evaluate intake and apparent digestibility of agro-industrial by-product of peach palm in diets for lambs. Twenty castrated, crossbred Santa Ines lambs, with average age of 150 days and body weight of 22.4 ± 3.4 kg, were distributed in a completely randomized design with four experimental diets composed of the following: fresh by-product of peach palm enriched with urea + ammonia sulfate (FU); fresh peach palm by-product + concentrate (FP); silage of peach palm by-product + concentrate (SP); and silage of peach palm by-product enriched with 15% of cornmeal + concentrate (SPC). Intake was recorded daily, and the digestibility coefficients were estimated with the internal marker indigestible acid detergent fiber (iADF). Diet FU resulted in the lowest intake and digestibility of the nutrients evaluated. Animals receiving diet FP showed higher intakes of dry matter (DM), organic matter (OM), crude protein (CP), neutral detergent fiber (NDF), total digestible nutrients (TDN), and digestible energy (DE) in relation to animals fed diets SP and SPC. Diets SP and SPC showed higher coefficients of digestibility of DM, OM, CP, and NDF than diet FP. Diet SP reduced the intakes of DM, OM, ether extract (EE), non-fibrous carbohydrate (NFC), TDN, and DE and the digestibility coefficients of DM, OM, and NFC as compared with diet SPC. Feedlot lambs fed a diet with fresh peach palm by-product + concentrate (diet FP) have higher nutrient intake.
This study aimed to evaluate the effect of the level of crude glycerin (CG) on in vitro fermentation kinetics (0, 20, 40, 60, and 80 g/kg DM of sugar cane silage), on in vitro neutral detergent fiber (NDF) degradation (0, 30, 60, and 90 g/kg DM of sugar cane silage), and intake and digestibility of nutrients and nitrogen balance (0, 20, 55, 82, and 108 g/kg DM of sugar cane silage) in lambs. The in vitro trials were conducted in a completely randomized design with three repetitions. The in vivo trial was conducted in a Latin square design with five repetitions (5 × 5). For variables in which the F test was considered significant, the statistical interpretation of the effect of CG substitution levels was carried out through regression analyses. Kinetic parameters were not affected by CG inclusion. On in vitro NDF degradation, a significant effect of CG levels was observed on the potentially degradable fraction of NDF, the insoluble potentially degradable fraction of NDF, and the undegradable NDF fraction. The intake and digestibility of nutrients and nitrogen balance were not affected by CG inclusion. The CG levels change in vitro NDF degradability parameters; however, there were no changes in animal intake, digestibility, and nitrogen balance with the inclusion levels used.
IntroduçãoInformações sobre parâmetros nutricionais e de desempenho em fêmeas zebuínas, taurinas e mestiças, criadas em condições tropicais são necessárias para determinação do valor nutritivo das dietas, partição de energia e exigências nutricionais. Esses dados são fundamentais para o estabelecimento de normas e padrões de alimentação para fêmeas de origem leiteira, as quais têm o objetivo de orientar a formulação de dietas mais precisas e, assim, melhorar a eficiência bioeconômica dos sistemas de produção de leite. O objetivo deste trabalho foi avaliar os efeitos do plano alimentar e do grupo racial sobre a digestibilidade aparente da matéria seca e nutrientes em novilhas leiteiras de importantes grupos raciais para a pecuária nacional. Fundamentação TeóricaO monitoramento das taxas de crescimento na recria de novilhas leiteiras, para otimizar a eficiência e os ganhos produtivos, bem como reduzir a idade à puberdade, pode representar uma estratégia para redução de custos de produção na pecuária leiteira.Parte da tese de Doutorado do segundo autor, financiada pela EMBRAPA, CAPES, FAPEMIG, FAPEMIG-PPM, PVE-CAPES e CNPq. ¹Professora do Instituto Federal de Educação, Ciência e Tecnologia Baiano (IFBaiano), camilla
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