Roughages for growing pigs, with emphasis on chemical composition, ingestion and faecal digestibility

Citation
D. Carlson et al., Roughages for growing pigs, with emphasis on chemical composition, ingestion and faecal digestibility, ACT AG SC A, 49(3), 1999, pp. 129-136
Citations number
29
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Animal Sciences
Journal title
ACTA AGRICULTURAE SCANDINAVICA SECTION A-ANIMAL SCIENCE
ISSN journal
0906-4702 → ACNP
Volume
49
Issue
3
Year of publication
1999
Pages
129 - 136
Database
ISI
SICI code
0906-4702(199909)49:3<129:RFGPWE>2.0.ZU;2-1
Abstract
Two experiments, each with 10 gilts of 30 kg initial bodyweight, were set u p to gain experience in feeding three roughages under controlled experiment al conditions. The experiments were designed to establish what proportion o f the total diets the roughages can make up without refusal, and to get pre liminary results on the apparent faecal digestibility of diets containing t hree kinds of roughage. In experiment 1 (exp. 1), the roughage consisted of either fresh or frozen (thawed) clover-grass. In experiment 2 (exp. 2), cl over-grass silage and whole-crop pea-barley silage was studied. The faecal digestibility of gross energy (GE), dry matter (DM), organic matter (OM), d ietary fibre (DF) and crude protein (CP) were measured for pigs fed diets i ncluding these roughages. The three roughages, leaves and stems of clover-g rass and the basal diets were also tested for in vitro OM digestibility. Roughage intake was similar in both experiments. The average proportion of roughage ingested was 18-19% of DM. There were no differences between fresh and frozen (thawed) clover-grass nutrient digestibility values. Glucose (c ellulose) and xylose were the main constituents of the non-starch polysacch arides (NSP) in the roughages, with whole-crop pea-barley silage having the highest content. The faecal digestibility of NSP was significantly lower f or diets based on whole-crop pea-barley silage compared to clover-grass sil age (exp. 2). In both experiments, the GE, DM, OM and CP digestibility did not differ. The in vitro OM digestibility demonstrated superior values for clover-grass leaves compared to the stems.