Performance, carcass traits and meat quality of lambs fed coffee hulls treated with calcium oxide

https://doi.org/10.1016/j.anifeedsci.2020.114471Get rights and content
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Highlights

  • Performance was not affected by inclusions up to 160 g/kg of treated coffee hulls.

  • DM and CP digestibility decreased linearly as levels of treated coffee hulls increase.

  • Treated coffee hulls with calcium oxide do not affect meat quality of lambs.

Abstract

The aim of this study was to evaluate the effects of replacing corn silage by coffee hulls treated with calcium oxide (CaO) on growth performance, carcass traits and meat quality parameters of lambs. Twenty-eight crossbred, non-castrated male lambs, weaned at three months of age with average initial body weight of 20.24 ± 2.40 kg were housed in individual pens. Lambs were randomly assigned to one of the four experimental treatments, which consisted of increased feeding levels of treated coffee hulls (TCH) (0, 80, 160 and 240 g/kg on DM basis). The forage concentrate ratio was 50:50 on dry matter (DM) basis and the diets were formulated to supply nutrient requirements of growing lambs with average daily gain (ADG) of 200 g. After 66 days of experimental period, lambs were slaughtered for further carcass traits and meat quality evaluations. As results, increased feeding levels of TCH in the diets led to a quadratic effect on intake of DM and its components (P < 0.05), values were highest at the intermediate addition level. Moreover, as level of TCH increased in the diets, both DM and crude protein (CP) apparent digestibility declined linearly (P = 0.001). However, apparent digestibility of neutral detergent fiber corrected for ash and protein contents (apNDF), ether extract (EE) and non-fiber carbohydrates (NFC) were not influenced by treatments (P > 0.05). Values of final body weight and ADG were similar up to 160 g/kg of corn silage replacement. A quadratic effect was observed for shear force (WBSF) (P = 0.029), the only meat quality parameter that showed significant effect. Lower values of WBSF were observed at the intermediated levels of corn silage replacement. Coffee hulls treated with CaO can be used as corn silage substitute at levels up to 160 g/kg because lambs performance and meat quality are not affected.

Abbreviations

ADF
acid detergent fiber
apNDF
neutral detergent fiber corrected for ash and protein content
ADG
average daily gain
CaO
calcium oxide
CCY
cold carcass yield
CCW
cold carcass weight
CP
crude protein
DM
dry matter
DMI
dry matter intake
EE
ether extract
FBW
final body weight
HCY
hot carcass yield
HCW
hot carcass weight
iNDF
indigestible neutral detergent fiber
NDF
neutral detergent fiber NFC non-fiber carbohydrate
TCH
treated coffee hulls
TDN
total digestible nutrients
TMR
total mixed ration
WBSF
Warner-Bratzler shear force

Keywords

Alkaline treatment
Alternative feed
Crop residue
Ruminant
Sheep

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