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| Author(s): |
Evandro Maia Ferreira
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | Piracicaba. |
| Institution: | Universidade de São Paulo (USP). Escola Superior de Agricultura Luiz de Queiroz (ESALA/BC) |
| Defense date: | 2008-06-12 |
| Examining board members: |
Alexandre Vaz Pires;
Claudio Vaz di Mambro Ribeiro;
Paulo Henrique Mazza Rodrigues
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| Advisor: | Alexandre Vaz Pires |
| Abstract | |
Two experiments were conducted to evaluate the effects of partial replacement of corn by soybean hulls (SH) on performance, carcass characteristics, ingestive behavior, apparent digestibility of nutrients, nitrogen balance and ruminal and blood parameters of Santa Ines lambs. The control treatment (SH0) was a diet containing 70% of corn on a DM basis. On the others diets corn was replaced by SH at 15, 30 and 45%, corresponding to the experimental treatments SH0, SH15, SH30 and SH45, respectively. All diets were isonitrogen (19.12 ± 0.60% of CP), containing 90% of concentrate and 10% \"coastcross\" hay (Cynodon sp.). In Trial 1 (apparent digestibility of nutrients, nitrogen balance, ruminal and blood parameters), sixteen Santa Ines ram lambs (BW 44.0 ± 5.0 kg and 6 months old) were allotted individually in suspended metabolism crates, assigned to a complete randomized block design. DM, OM, NDF, ADF and CP intake (kg/day and g/kg of BW0,75), and also TDN intake (kg/day), DE intake (kg/day), increased linearly (P < 0.05) with SH addition. Nitrogen retention decreased linearly (P < 0.05) and propionate concentration (mM) showed a quadratic response (P < 0.05). There was no effect on EE intake (g/kg of BW0,75), TDN values (% of DM), DE concentration (Mcal/kg of DM), apparent digestibility of DM, NFC, CP, EE, and ruminal ammonia and total SCFA concentrations. In Trial 2 (performance, carcass characteristics and ingestive behavior), sixty-four Santa Ines lambs (BW 18,3 ± 2,8 kg and 69 ± 5 days old) were penned (2/pen) and used in a complete randomized block with four treatments and eight replicates. ADG, carcass characteristics and the times expended in ingestion (min/g of DM), rumination (min/day and min/g of DM) and chewing (min/day) activities there was no effect treatments. DMI and NDF intake, FC and the times expended in rumination (min/g of NDF) and chewing (min/g of DM) increased linearly (P < 0.05) with SH addition. SH inclusion in the diet at replacing corn, increased nutrients and DE intake and improved ruminal pH. with no detrimental effect on ADG and carcass characteristics. However, decreased nitrogen retention and worsened the FC. (AU) | |