Performance, carcass and ruminal fermentation characteristics of heifers fed concentrates differing in energy level and cereal type (corn vs. wheat)
| Autor: | Alfonso Fuentetaja, Coral Carrasco, María Dolores Carro, Pedro Medel |
|---|---|
| Přispěvatelé: | Spanish Ministry of Economy and Competitiveness (PROFIT grant program, FIT060000200511), Centro para el Desarrollo Tecnológico Industrial (IDI-20050617) |
| Rok vydání: | 2018 |
| Předmět: |
0301 basic medicine
in vitro fermentation High energy Net energy Body weight Feed conversion ratio lcsh:Agriculture 03 medical and health sciences beef cattle Carcass weight Animal science Ruminal fermentation 2. Zero hunger Agriculture Livestock Animal Production Chemistry ruminal pH volatile fatty acids Agricultura lcsh:S 0402 animal and dairy science 04 agricultural and veterinary sciences Straw 040201 dairy & animal science 030104 developmental biology Agronomy Feedlot Agronomy and Crop Science |
| Zdroj: | Spanish Journal of Agricultural Research, Vol 15, Iss 4, Pp e0606-e0606 (2018) Spanish Journal of Agricultural Research, ISSN 1695-971X, 2017-07, Vol. 14, No. 5 Spanish Journal of Agricultural Research; Vol 15, No 4 (2017); e0606 Spanish Journal of Agricultural Research; Vol. 15 No. 4 (2017); e0606 Spanish Journal of Agricultural Research; Vol. 15 Núm. 4 (2017); e0606 SJAR. Spanish Journal of Agricultural Research instname Archivo Digital UPM Universidad Politécnica de Madrid |
| ISSN: | 2171-9292 |
| DOI: | 10.5424/sjar/2017154-11230 |
| Popis: | A total of 144 beef heifers (218 ± 26.4 kg body weight) were housed in 24 pens (6 animals each) and used in a 168-day feedlot study to evaluate the influence of cereal type and energy level on performance, carcass quality and ruminal fermentation. Four concentrates were formulated according to a 2×2 factorial arrangement of treatments, with two energy levels (1,452 vs. 1,700 kcal net energy/kg) and two main cereals (wheat vs. corn). Concentrate and straw were offered ad libitum. Concentrate intake and body weight were recorded on days 42, 84, 126 and 168. Ruminal fluid was obtained by ruminocentesis from 3 heifers per pen on days 1, 84 and 168; and carcass weight, classification and yield, were determined in the same animals. Heifers fed high-energy diets had lower intake (6.97 vs. 7.29 kg fresh matter/d; p=0.011), and lower concentrate to gain ratio (5.15 vs. 5.66 kg/kg; p=0.002) than those fed low energy concentrates, and tended (p=0.069) to be heavier along the time. Neither carcass yield and classification, nor ruminal pH, volatile fatty acids nor NH3-N concentrations were affected (p>0.050) by energy level. Total volatile fatty acids concentration tended (p=0.070) to be greater in heifers fed corn-based than wheat-based concentrates. No energy level x cereal type interactions were observed. These results indicate that high energy concentrates decreased feed intake and feed conversion but had minor effects on carcass performance. Cereal type had no effects on performance and ruminal fermentation and no interactions between cereal type and energy were detected. |
| Databáze: | OpenAIRE |
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