ORCID Profile
0000-0002-7020-3001
Current Organisation
Universidade Federal do Rio Grande do Sul
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Publisher: Routledge
Date: 25-11-2016
Publisher: Elsevier BV
Date: 06-2012
Publisher: Brill | Wageningen Academic
Date: 2005
Publisher: Cambridge University Press (CUP)
Date: 31-05-2013
DOI: 10.1017/S0021859613000294
Abstract: The current research was carried out to evaluate the use of crude protein and fibre components in faeces for estimating intake and digestibility in sheep fed with pearl millet ( Pennisetum americanum (L.) Leeke). The equations were developed from four trials in metabolism cages with 16 sheep in each trial. Each animal received a different quantity of millet leaves in the diet: 0·015, 0·020 and 0·025 dry matter (DM) as a proportion of live weight (LW) and ad libitum with at least 0·2 of daily feed refusals. Organic matter intake (OMI, g/day) was measured, through the difference between offer and refusals total faeces were collected for 5 days, which was used to determine faecal crude protein (CPf, g/day and g/kg of organic matter (OM)), faecal neutral detergent fibre (NDFf, g/day and g/kg OM), faecal acid detergent fibre (ADFf, g/day and g/kg OM) and OM digestibility (OMD). Linear regression equations were calculated to determine the relationship between OMI and CPf ( P ·001, R 2 =0·90, relative prediction error (RPE=14·02%). A multiple linear equation was generated for OMI including CPf and NDFf ( P ·001, R 2 =0·94 RPE=9·25%). Hyperbolic (single and multiple) and exponential models were tested to estimate OMD, where the hyperbolic multiple model including CPf and NDFf showed lower RPE (3·90%). These equations for estimating OMI and OMD were evaluated on sheep grazing P. americanum fertilized with increasing levels of nitrogen (N) (50, 100, 200 and 400 kg N/ha), comparing measured and estimated OMI. The intake estimated by multiple regression (CP and NDFf) showed a higher R 2 (0·98) and lower RPE (5·25%) than the simple (CPf only) linear equation ( R 2 =0·94 RPE=20·45%). The results demonstrated the feasibility of using the faecal index generated in metabolism cages for estimating intake and digestibility in sheep grazing P. americanum .
Publisher: Elsevier BV
Date: 07-0004
Publisher: Wageningen Academic Publishers
Date: 02-04-2005
Publisher: Elsevier BV
Date: 06-2014
Location: Brazil
No related grants have been discovered for Paulo César de Faccio Carvalho.