Ngày nhận bài: 01-10-2015
Ngày duyệt đăng: 09-12-2015
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Ảnh hưởng của mức xơ và nguồn xơ trong khẩu phần ăn đến phát thải nitơ, phôtpho, hydro sulfua, ammoniac và khí nhà kính từ chất thải của lợn thịt
,
Pham Kim Dang
2
Từ khóa
Excretion, fibre level, fibre sourse, gas emission, pig diet, slurry
Tóm tắt
This study was carried out to evaluate the effect of different fibre levels and fibre sources in the pig diet on nitrogen (N) and phosphorus (P) excretions, and ammonia (NH3), hydrogen sulphide (H2S) and greenhouse gas (GHG) emissions from slurry. A total of 24 pigs with the initial body weight (BW) around 24 ± 0,25 kg were kept individually in concrete floored pens (1.8 m x 0.8 m) in an open-sided house. The experiment was structured according to a completely randomized 2 x 2 factorial design, with two fibre sources [tofu residue (TFR) and coconut cake (CC)] and two fibre levels [low fibre (LF) and high fibre (HF)]. Each treatment consisted of 6 pens, with one pig per pen as a replicate. Results show that, in growing period, pigs fed LF diet had higher slurry pH and lower N excretion than those in pigs fed HF diet (P > 0.05). Fibre source and fibre level had no effects on the slurry characteristics and the excretion of slurry DM and P (P > 0.05). The CH4 emission was higher for the diet CC than for the diet TFR (P > 0.05). Increased dietary fibre level resulted in increased the CH4 and CO2 emission, and decreased NH3 emission (P > 0.05). In fattening period, slurry chemical characteristics, N and P excretion were not effected by fibre source and fibre level (P > 0.05). Pigs fed diet TFR had greater the NH3 emission from slurry than those in pigs fed diet CC (P > 0.05). The H2S and CO2 emissions were not affected by fibre level (P > 0.05). Pigs fed HF diet showed higher CH4 emission than those pigs fed LF diet, while NH3 emission was significantly higher in LF than that in HF diet (P > 0.05).
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