Skip to Main content Skip to Navigation
Journal articles

Effects of feeding system and slaughter age on the growth and carcass characteristics of tropical-breed steers

Abstract : This study aimed to compare the growth performances and carcass characteristics of tropical-breed steers reared in 2 contrasted feeding systems (indoor vs. pasture) and slaughtered at different ages (early vs. late). A total of 309 Creole steers (growing at an initial BW of 173 +/- 3 kg and an initial age of 252 +/- 4 d) were used over a continuous 12-yr study. Indoor steers were housed in a cattle shed, fed fresh-cut grass plus concentrate, and slaughtered at 14.5 or 17.1 +/- 0.1 mo of age. Pasture steers were pasture grazed without supplemental feed, and slaughtered at 17.6 and 21.2 +/- 0.1 mo of age. Indoor-fed steers had a greater ADG (786 vs. 517 +/- 29 g.d(-1); P < 0.0001) and more carcass fat (164 vs. 145 +/- 4.5 g.kg(-1); P = 0.001) than pasture-fed steers. Late-slaughtered steers had decreased ADG (630 vs. 673 +/- 27 g.d(-1); P = 0.001) but greater dressing percentages (hot dressing percentage = 55.7 vs. 54.7 +/- 0.34%; chilled dressing percentage = 54.5 vs. 53.4 +/- 0.34%; P < 0.0001) than early-slaughtered steers. The interaction between feeding system and slaughter age was significant for carcass tissue composition. Whole-carcass muscle content was greater in late-slaughtered steers than early-slaughtered steers, especially in pasture-fed steers (720 vs. 698 +/- 6.0 g.kg(-1); P < 0.0001), but less so in indoor-fed steers (707 vs. 700 +/- 5.9 g.kg(-1); P = 0.046). Furthermore, increasing slaughter age had no effect on carcass fat in indoor-fed steers (162 vs. 166 +/- 4.8 g.kg(-1); P = 0.342), but decreased carcass fat in pasture-fed steers (150 vs. 140 +/- 5.0 g.kg(-1); P = 0.014). The results showed that slaughter age and feeding system are 2 major factors that independently affect most of the growth and carcass traits of tropical-breed steers but jointly influence tissue deposition. Our study found that in tropical-breed steers that are grazing, late slaughtering grazing steers increased carcass muscle content without extra fat, thus yielding a carcass quality better suited to consumer choices.
Document type :
Journal articles
Complete list of metadata

Cited literature [35 references]  Display  Hide  Download

https://hal.inrae.fr/hal-02646763
Contributor : Migration Prodinra <>
Submitted on : Friday, May 29, 2020 - 5:34:52 AM
Last modification on : Thursday, April 22, 2021 - 5:00:02 PM

File

2013_Agastin_Journal_of_Animal...
Publisher files allowed on an open archive

Identifiers

Collections

Citation

Aurélie Agastin, Michel Navès, Alain Farant, Xavier Godard, Bruno Bocage, et al.. Effects of feeding system and slaughter age on the growth and carcass characteristics of tropical-breed steers. Journal of Animal Science, American Society of Animal Science, 2013, 91 (8), pp.3997-4006. ⟨10.2527/jas.2012-5999⟩. ⟨hal-02646763⟩

Share

Metrics

Record views

24

Files downloads

81