Energy efficiency of growing ram lambs fed concentrate-based diets with different roughage sources

Journal of Animal Science
D B GalvaniL O Tedeschi

Abstract

Poor-quality roughages are widely used as fiber sources in concentrate-based diets for ruminants. Because roughage quality is associated with the efficiency of energy use in forage-based diets, the objective of this study was to determine whether differing the roughage source in concentrate-based diets could change the energy requirements of growing lambs. Eighty-four 1/2 Dorper × 1/2 Santa Inês ram lambs (18.0 ± 3.3 kg BW) were individually penned and divided into 2 groups according to primary source of dietary roughage: low-quality roughage (LQR; sugarcane bagasse) or medium-quality roughage (MQR; coastcross hay). Diets were formulated to be isonitrogenous (2.6% N) and to meet 20% of physically effective NDF. After a 10-d ad libitum adaptation period, 7 lambs from each group were randomly selected and slaughtered (baseline). Twenty-one lambs in each diet group were fed ad libitum and slaughtered at 25, 35, or 45 kg BW. The remaining 28 lambs (14 from each diet group) were submitted to 1 of 2 levels of feed restriction: 70% or 50% of the ad libitum intake. Retentions of body fat, N, and energy were determined. Additionally, 6 ram lambs (44.3 ± 5.6 kg BW) were kept in metabolic cages and used in a 6 × 6 Latin square experiment ...Continue Reading

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Citations

Feb 10, 2016·Journal of Animal Physiology and Animal Nutrition·E S PereiraS P Gomes
Jun 28, 2016·Tropical Animal Health and Production·Elzania Sales PereiraLeilson Rocha Bezerra
Jul 21, 2016·Journal of Animal Physiology and Animal Nutrition·F O M FigueiredoI A M A Teixeira
Mar 3, 2017·Journal of Animal Physiology and Animal Nutrition·A P OliveiraM I Marcondes
Oct 7, 2015·Journal of Animal Science·A K AlmeidaI A M A Teixeira
Apr 12, 2016·Journal of Animal Science·V N GouvêaF A P Santos
Mar 28, 2017·Journal of Dairy Science·A P SouzaI A M A Teixeira
Jun 6, 2017·Animal : an International Journal of Animal Bioscience·E S PereiraR L Oliveira
Feb 23, 2019·Animal : an International Journal of Animal Bioscience·A A MartinsC C Pires
Mar 17, 2020·Animal : an International Journal of Animal Bioscience·A K AlmeidaI A M A Teixeira
Jun 29, 2021·Frontiers in Veterinary Science·Marcilio S MendesElzania S Pereira

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