The management of reproduction of local breeds of pigs is the key factor influencing their reproductive efficiency, genetic and biodiversity. The production of offspring and their further raising make the basis of production organization, as well as management strategies in conservation procedure for local pig breeds. The aim of this study was to analyse and evaluate Litter Size (LS) traits in two autochthonous pig breeds according to their similarity in breeding procedure, as Management of Farrowing (MF) and Number of Sows per Herd (NSH), to improve their reproductive performance and self-sustainability. Data analysis included 2026 parities of Black Slavonian (BS) and 906 of Nero di Parma (NP), from the 1st to 10th parity (PAR). The LS traits referred to Total Number of Born (TNB), Number of Born Alive (NBA) and Number of Weaned (NW) piglets. Data analysis was performed using GLM (SAS). Five effects with two double interactions were included in the model of calculation to analyse the possible factors influencing between-breed differences in reproductive efficiency. The following effects were tested: breed (BR), PAR, four season of farrowing (SF) according to calendar year, NSH (three levels: 1-3, 4-10 and ˃10 reproductive sows per herd) and MF (two levels: controlled farrowing in roofed premises and farrowing at uncontrolled and non-roofed sites) with interaction in the scalar equation as BRMF and BRNSH. The results were expressed as Least Squares Means ± SE. Pooled farrowing analysis showed TNB to be lower in BS (6.93 ± 0.08) compared with NP sows (8.31 ± 0.13), with significant effects (p<.05) of BR, PAR, MF, BRNSH and BRMF. The NBA was 6.48 ± 0.09 in BS vs 8.01 ± 0.15 in NP sows, with significant effects (p<.05) of BR, PAR, MF, BRNSH and SF. The analysis of NW with 6.24 ± 0.09 in BS and 6.47 ± 0.15 in NP sows pointed to significant effects (p<.05) of PAR, SF, MF, BRNSH and BRMF. Accordingly, differences between the breeds could be ascribed to the higher number of controlled farrowing in population of NP vs BS with the best results in LS within a group from 4 to 10 sows per herd.
LITTER SIZE TRAITS IN BLACK SLAVONIAN AND NERO DI PARMA PIG BREEDS: EFFECTS OF FARROWING MANAGEMENT AND SOW NUMBER PER HERD / Mencik, Sven; Spehar, Marija; Mahnet, Zeljko; Knezevic, Dominik; Ostovic, Mario; Beretti, Valentino; Superchi, Paola; Sabbioni, Alberto. - In: ITALIAN JOURNAL OF ANIMAL SCIENCE. - ISSN 1828-051X. - 16:(2017), pp. 145-146. (Intervento presentato al convegno 22nd ASPA CONGRESS tenutosi a Perugia nel 13-16 giugno 2017).
LITTER SIZE TRAITS IN BLACK SLAVONIAN AND NERO DI PARMA PIG BREEDS: EFFECTS OF FARROWING MANAGEMENT AND SOW NUMBER PER HERD
BERETTI, Valentino;SUPERCHI, Paola;SABBIONI, Alberto
2017-01-01
Abstract
The management of reproduction of local breeds of pigs is the key factor influencing their reproductive efficiency, genetic and biodiversity. The production of offspring and their further raising make the basis of production organization, as well as management strategies in conservation procedure for local pig breeds. The aim of this study was to analyse and evaluate Litter Size (LS) traits in two autochthonous pig breeds according to their similarity in breeding procedure, as Management of Farrowing (MF) and Number of Sows per Herd (NSH), to improve their reproductive performance and self-sustainability. Data analysis included 2026 parities of Black Slavonian (BS) and 906 of Nero di Parma (NP), from the 1st to 10th parity (PAR). The LS traits referred to Total Number of Born (TNB), Number of Born Alive (NBA) and Number of Weaned (NW) piglets. Data analysis was performed using GLM (SAS). Five effects with two double interactions were included in the model of calculation to analyse the possible factors influencing between-breed differences in reproductive efficiency. The following effects were tested: breed (BR), PAR, four season of farrowing (SF) according to calendar year, NSH (three levels: 1-3, 4-10 and ˃10 reproductive sows per herd) and MF (two levels: controlled farrowing in roofed premises and farrowing at uncontrolled and non-roofed sites) with interaction in the scalar equation as BRMF and BRNSH. The results were expressed as Least Squares Means ± SE. Pooled farrowing analysis showed TNB to be lower in BS (6.93 ± 0.08) compared with NP sows (8.31 ± 0.13), with significant effects (p<.05) of BR, PAR, MF, BRNSH and BRMF. The NBA was 6.48 ± 0.09 in BS vs 8.01 ± 0.15 in NP sows, with significant effects (p<.05) of BR, PAR, MF, BRNSH and SF. The analysis of NW with 6.24 ± 0.09 in BS and 6.47 ± 0.15 in NP sows pointed to significant effects (p<.05) of PAR, SF, MF, BRNSH and BRMF. Accordingly, differences between the breeds could be ascribed to the higher number of controlled farrowing in population of NP vs BS with the best results in LS within a group from 4 to 10 sows per herd.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
