Estimation of the maintenance energy requirements, methane emissions and nitrogen utilization efficiency of two suckler cow genotypes
| Autor: | F. O. Lively, A. R. G. Wylie, C. X. Zou, Tianhai Yan |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
0301 basic medicine
Methane emissions Genotype Nitrogen Silage nitrogen output grass silage chemistry.chemical_element Poaceae Energy requirement SF1-1100 Methane enteric methane emissions Feces 03 medical and health sciences chemistry.chemical_compound Animal science energy metabolism Animals Lactation Dry matter business.industry 0402 animal and dairy science 04 agricultural and veterinary sciences 040201 dairy & animal science Manure Breed Diet Biotechnology Animal culture Milk 030104 developmental biology chemistry Environmental science Cattle Female Animal Science and Zoology suckler cow Energy Intake business |
| Zdroj: | Animal, Vol 10, Iss 4, Pp 616-622 (2016) |
| ISSN: | 1751-7311 |
| Popis: | Seventeen non-lactating dairy-bred suckler cows (LF; Limousin×Holstein-Friesian) and 17 non-lactating beef composite breed suckler cows (ST; Stabiliser) were used to study enteric methane emissions and energy and nitrogen (N) utilization from grass silage diets. Cows were housed in cubicle accommodation for 17 days, and then moved to individual tie-stalls for an 8-day digestibility balance including a 2-day adaption followed by immediate transfer to an indirect, open-circuit, respiration calorimeters for 3 days with gaseous exchange recorded over the last two of these days. Grass silage was offered ad libitum once daily at 0900 h throughout the study. There were no significant differences (P>0.05) between the genotypes for energy intakes, energy outputs or energy use efficiency, or for methane emission rates (methane emissions per unit of dry matter intake or energy intake), or for N metabolism characteristics (N intake or N output in faeces or urine). Accordingly, the data for both cow genotypes were pooled and used to develop relationships between inputs and outputs. Regression of energy retention against ME intake (r 2=0.52; P |
| Databáze: | OpenAIRE |
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