The influence of dietary fibre on body composition, visceral organ weight, digestibility and energy balance in rats housed in different thermal environments

Abstract

Tbe present study was undertaken to provide detailed information on the effect of dietary fibre (DF) level on body composition, visceral organ weight, nntrient digestibility and on energy and protein metabolism of rats housed in cold (16"), warm (24") or hot (32") thermal environments. High-or low-fibre diets (257 v. 56 g DF/kg dry matter (DM)) were studied in a 6-week balance experiment (initial body weight about 100 9). Heat production was measured using open-air circuit respiration chambers. Pea fibre and pectin were used to adjust the DF level in the high-fibre diet. The ranking order of daily gain of rats kept in different environments was: 24" > 16' > 32", while the ranking order for carcass protein was: 16" > 24"> 32". Rats on the high-DF diet bad a lower daily gain than those on the low DF diet, and more protein in DM of empty body weight (EBW) and less fat. The relative weights (g/kg EBW) of liver, heart and kidney decreased when increasing the environmental temperature. The relative weight of the heart was highest in rats on the high DF level, while liver and kidney weights were unaffected by DF. Per kg EBW, the stomach, small intestine, caecum and colon and the length of colon were signillcantly greater in rats consuming the high-fibre diet compared with those on the low-fibre diet. Rats kept at low temperature had a significantly heavier gastrointestinal (GI) tract than those kept at the highest temperature. Digestibility of protein, DM and energy was lowest for rats fed on the high-fibre diet. Heat production (HP) of fed rats as well as fasting HP decreased significantly as environmental temperature increased.HP as a proportion of metabolizable energy (ME) was significantly lower for rats at 24" compared with the other environmental temperatures. The proportion of energy retained as protein was slightly higher in rats fed on the high-fibre than on the low-fibre diet. Based on the results of tbe present study the authors measured a net energy value of 5.4 kJ/g DF fermented; approximately 50% of the DF came from peas. Possible implications of the present findings are discussed.

Resposta de suínos em crescimento mantidos em diferentes temperaturas

“…Não foi observado efeito (p>0,05) do ambiente térmico sobre o comprimento do intestino delgado. A redução nos pesos de órgãos dos animais mantidos em ambiente quente, provavelmente, deve-se à tentativa de reduzir a produção de calor pelos órgãos metabolicamente ativos (Zhao et al, 1995).…”

Influência da temperatura ambiente sobre o desempenho e os parâmetros fisiológicos de suínos machos castrados dos 30 aos 60 kg

“…A redução nos pesos de órgãos dos animais mantidos em ambiente quente, provavelmente, devese à tentativa de reduzir a produção de calor pelos órgãos metabolicamente ativos (ZHAO et al, 1995).…”

Assessment of Nano Cellulose from Peach Palm Residue as Potential Food Additive: Part II: Preliminary Studies

“…The water retention capacity of the fiber can influence the digestion and absorption of minerals (Zhao et al 1995). All (Slavin et al 2009).…”

“…These include: (i) body weight to know about quantity of diet taken, (ii) blood analysis for glucose, lipid profile through determination of total cholesterol, HDL and LDL, (iii) analysis of feces (excreta) to know about the quantity of minerals excreted and (iv) study of liver to know about any variation occurring between various groups of animals due to the diets consumed by them. In fact, the functions of various minerals in the body of living beings are given elsewhere (American Medical Association 1979;Cormark 1994;Soetan et al 2010;Junqueira and José 2013;Reeves et al 1993;Schweizer and Edwards 1992;Slavin et al 2009;Teixeira 2001;Weaver and Heaney 1999;Zhao et al 1995).…”