Production results and the level of metabolic-hormonal rates in compensatory fattening of pigs
Wiecek,J.; Rekiel,A.; Skomia,J.
Medycyna Weterynaryjna 64(11): 1320-1323
ISSN/ISBN: 0025-8628 Accession: 032972558
The aim of the research was to determine the influence of a mixture enriched by linseed oil, after a restricted feeding period, on production results and the concentration of selected hormones (GH, TSR, T3, T4,insulin) as well as protein-lipid transformation Indicators (TV, ALB, GLU, BUN, TG, CR) in fatteners. The experimental fattening was carried out on 56 fatteners (Polish Large White x Polish Landrace x Duroc) (gilts : barrows, 1:1). In the first stage of fattening (2340 kg of body weight) the animals were fed semi ad libitum or restrictively (less by 25%) on feeds without the linseed oil supplement. In the second fattening stage (60-102 kg of body weight) all the animals were fed semi ad libitum on mixtures with 0 or 4% share of linseed oil. Restricted feeding in the first fattening stage caused a reduction of growth rate as well as changes in hormonal management, i.e. the increase of GH and decrease of T4 and insulin. The level of protein-lipid transformation indicators decreased, including total cholesterol and its LDL fraction, which decreased high-significantly. The increase in the feeding level during the second fattening stage led to hormonal "normalisation", and a small compensatory growth was found only in animals receiving the feed with oil. The linseed oil supplement to the feed sped up the growth rate of the swines, which was connected with changes of some hormone levels (T3, T4, insulin) as well as protein lipid transformation indicators (TP, ALB, TG).