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Title: Studies on the degradation kinetics of botanically diverse fibrous feeds and their apparent digestibility and rate of passage when fed to ponies
Author: Moore-Colyer, M. J. S.
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 2001
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The aim of this thesis was to measure the in vivo apparent digestibility of a range of botanically diverse fibrous-feeds and to investigate the suitability of ruminant in sacco and in vitro techniques as routine methods for estimating, degradation kinetics and rates of passage of fibrous feeds through the gastrointestinal tract of ponies. In the first study, the in vivo apparent digestibility (AD) of hay (H), haylage (HY), big bale silage (BB) and clamp silage (CS) were determined in 4 ponies. Dry matter intake was significantly (P<0.05) greater for HY (6.3 kg d-1) and BB > H > CS (2.95 kg d-1). For all parameters measured AD of CS and BB were significantly (P<0.05) greater than for H, with HY being intermediate. The theoretical digestible energy and crude protein requirements of the ponies were met or exceeded by all diets except hay. Secondly, the in vivo AD, intra-caecal fermentation parameters and rates of passage of hay cubes (HC), an oat hulls:naked oats mix (OH:NO), plain sugar beet pulp (SBF), soya hulls (SH) and a hay cubes:sugar beet mix (HC:SB) were determined in 3 caecally-fistulated ponies. Total collection and mobile bag studies produced similar AD values, with SBF being greater (P<0.05) for all parameters measured than OH:NO and HC, with intermediate values for SB:HC and SH. All feeds maintained the intrac-caecal pH and acetate molar proportions above 6.5 and 700 mmol mol-1 respectively. Higher levels of propionate and lactate and lower levels of butyrate were recorded for ponies fed the OH:NO compared with those on diets SBF and HC (P<0.05). Pre-caecal losses of total non-starch polysaccharides (TNSP) from feeds in sacco were highest for SBF (133g kg-1) > SH > OH:NO > HC (51 g kg-1). In contrast, the highest crude protein (CP) losses were from OH:NO (771 g kg-1) which were greater than SH = HC > SBF (296 d kg-1) (P<0.05).
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available