Increasing Energy and Lysine in Dkts for Growing-Finishing Pigs in Hot Environments: A Preliminary Study of the Consequences on Productive Performance, Slurry Composition and Gas Emission

摘要

The influence of dietary factors on manure composition and gas emission was studied in pigs. A total of 128 pigs weighing 63.1+9.67 kg were divided by weight and sex into two dietary treatments: one high (HD) and other low (LD) in energy and lysine, but maintaining lysine:energy ratio (LD; 13.97 MJDE kg"1, 0.72 g lysine MJ_1DE and HD; 14.39 MJDE kg"1, 0.77 g lysine MJ" ^E). Average daily gain and daily feed intake were controlled during 41 days (phase 1). After the productive study, 12 females of 103.3+3.15 kg (6 per treatment) were selected and housed individually (phase 2). Feces and urine (slurry) were collected during 3 consecutive days. After collection, slurry was pooled by treatment and six 30L buckets (3 per treatment) were filled and storedduring a 11-day period. Initial and final composition (dry matter (DM), organic matter (OM), total Kjeldahl nitrogen (TKN), volatile fatty acids (VFA) and pH) were analyzed. Gas emission was measured using a photoacoustic gas monitor. Both, males and females fed HD diets grew more efficiently than pigs fed LD diets (p<0.05). Slurry from pigs fed LD diets showed greater DM, OM, TKN and VFA concentrations and a lower final pH than slurry from HD pigs (p<0.05). Carbon dioxide and ammonia emission did notdiffer between treatments. Thus, the combination of high energy and lysine content used in the present study for growing pigs (HD) led to a more efficient growth and a lower nutrient concentration in slurry, with no significant differences in gas emission.