title: Impact of feed restriction on the performance of highly prolific lactating sows and its effect on the subsequent lactation.
abstract: A total of 50 mixed parity sows of a high-prolificacy genetic line were used to evaluate the impact of feed restriction during lactation on their production and reproductive performance and their performance in the subsequent lactation. From day 7 of lactation, sows were distributed according to a completely randomized experimental design into two treatments. In treatment 1, sows were fed 8.0 kg feed/day (control) and in treatment 2, sows were fed 4.0 kg/day. The same suckling pressure was maintained until weaning on day 28 of lactation. Average minimum and maximum temperatures measured during the experimental period were 32.1°C and 16.5°C, respectively. Control sows presented significantly higher feed intake (P0.10) in weaning-to-estrus interval and averaged 4.3 days. No effect of the treatment (P>0.10) was observed on any of the studied performance traits in the subsequent lactation, except for litter size at birth that tended (15.2 v. 14.1; P<0.10) to be lower for the restricted sows. In conclusion, the present study demonstrated that feed restriction during lactation leads to intense catabolism of the body tissues of sows, negatively affecting their milk production, and the litter weight gain and possibly number of piglets born in the next litter. On the other hand, restricted-fed sows are more efficient, producing more milk per amount of feed intake.
authors.affiliation: 1Animal Science Department,Universidade Federal do Paraná (UFPR),80035-050, Curitiba,Paraná,Brazil.
authors.forename: S
authors.initials: S
authors.lastname: De Bettio
authors.affiliation: 1Animal Science Department,Universidade Federal do Paraná (UFPR),80035-050, Curitiba,Paraná,Brazil.
authors.forename: A
authors.initials: A
authors.lastname: Maiorka
authors.affiliation: 1Animal Science Department,Universidade Federal do Paraná (UFPR),80035-050, Curitiba,Paraná,Brazil.
authors.forename: L N E
authors.initials: LN
authors.lastname: Barrilli
authors.affiliation: 2TOPIGS Research Center IPG,Schoenaker 6,6640 AA Beuningen,The Netherlands.
authors.forename: R
authors.initials: R
authors.lastname: Bergsma
authors.affiliation: 3Institute of Agricultural Sciences/ICA,Universidade Federal de Minas Gerais (UFMG),39404-547 Montes Claros,Minas Gerais,Brazil.
authors.forename: B A N
authors.initials: BA
authors.lastname: Silva
mesh_terms: D000818:Animals; D004032:Diet / Q000662:veterinary*; D004435:Eating; D004971:Estrus / Q000502:physiology; D005260:Female; D005508:Food Deprivation / Q000502:physiology*; D007774:Lactation / Q000235:genetics / Q000502:physiology*; D008098:Litter Size / Q000502:physiology; D008892:Milk / Q000378:metabolism*; D010298:Parity; D036801:Parturition; D011247:Pregnancy; D012098:Reproduction / Q000235:genetics / Q000502:physiology*; D013552:Swine / Q000235:genetics / Q000254:growth & development / Q000378:metabolism / Q000502:physiology*; D014886:Weaning; D015430:Weight Gain / Q000502:physiology*
keywords: efficiency; feed restriction; lactation; milk production; sows