3 research outputs found
Pesos e rendimentos de carcaça de cordeiros submetidos a diferentes manejos nutricionais pré-desmame
No full textSeleção da dieta e consumo de ração por borregos em aleitamento intermitente alimentados com ração total mista contendo três níveis de proteína bruta
No full textSupplying a high-quality ration during preweaning phase can accelerate the rumen development and improve lambs performance. This study aimed to evaluate the diet selection and feed intake of Santa Ines and ½Dorper × ½Santa Ines lambs fed with total mixed ration (TMR) containing three levels of crude protein (CP) and managed under intermittent suckling up to weaning. A total of 67 lambs were uniformly distributed according to breed pattern, body weight (BW), sex and type of birth into three treatments: 18, 21, and 24% CP in TMR. The experiment started when lambs had 34 ± 10 days of age and 9.60 ± 3.07 kg BW, and lasted 60 days. The TMR was provided ad libitum in feedlot and was composed of 32.4% of corn silage and 67.6% of protein-energy concentrate, on a dry matter basis. Orts were collected and weighed daily, and its average particle size (APS) was assessed using the Penn State Particle Separator. The characteristics of orts did not differ (P>0.05) among CP levels and showed mean values of 8.03 ± 0.86% for particles >19mm, 50.23 ± 2.39% for particles between 7.8 and 19mm, 27.91 ± 1.55% for particles between 1.8 and 7.8mm, 13.83 ± 1.29% for particles <1.8mm, and 6.62 ± 0.35mm for APS. These results indicate a similar feeding selection pattern among treatments. Moreover, lambs had preference by concentrate feed, since the APS of TMR was 4.70mm on average. Daily dry matter intake on weight basis (364.1 ± 47.9 g/lamb/day) and relative to BW (2.08 ± 0.18% BW/day) were not affected (P>0.05) by CP levels. Thus, increasing CP level in TMR does not influence the diet selection neither feed intake by lambs under intermittent suckling management. However, our findings suggest that protein intake increases with CP level of TMR provided to them
Comportamento alimentar de borregos sob maneio de amamentação intermitente e alimentados com três níveis de proteína bruta na ração total mista
No full textChanges in nutritional composition of feed may affects the feeding behavior of suckling lambs in terms of time spent in behavioral activities. This study aimed to evaluate the effect of three crude protein (CP) levels in the total mixed ration (TMR) on feeding behavior of lambs under intermittent suckling management up to weaning. A total of 67 Santa Ines and ½Dorper × ½Santa Ines lambs were uniformly distributed according to body weight (BW), sex and type of birth into three treatments: 18, 21, and 24% CP in TMR. The experimental design was completely randomized with 23, 21, and 23 replicates, respectively. Intermittent suckling management started when lambs had 34 ± 10 days of age and 9.60 ± 3.07 kg BW. Ewes were separated from lambs between 8:00-16:00 and fed with corn silage and energy concentrate. Lambs were fed ad libitum in feedlot with TMR composed of 32.4% corn silage and 67.6% protein-energy concentrate, and contained 72.2% of total digestible nutrients, on a dry matter basis. The TMR was offered at 8:00 and 13:00. The experiment lasted 60 days. Feeding behavior was continuously monitored during 72h between 54-56 days. Ten lambs per treatment were selected based on average BW in each treatment, and their behavioral activities were recorded at 10-min interval. Data of time spent feeding, ruminating, suckling and in idleness were analyzed by Kruskal-Wallis test (P<0.05). The increasing CP level in TMR did not affect lamb feeding behavior, with mean values of 246, 387, 7, and 800 min/day spent in feeding, rumination, suckling and idleness, respectively. In percentual basis, lambs spent 17.1, 26.9, 0.5, and 55.6% of day on these activities. Therefore, the increase of CP level from 18 to 24% in the diet does not promote changes in feeding behavior pattern of lambs under intermittent suckling management
