95815 20210902121823.0 doi 10.5424/sjar/2020182-15825 sideral 120150 ART-2020-120150 eng Seoane, S. Responses to different feeding levels during the first month post-insemination in highly prolific multiparous sows 2020 Access copy available to the general public Unrestricted Aim of study: To evaluate the impact of the feed level during the first month of gestation on body weight evolution, backfat and loin muscle depths and reproductive performances in highly prolific sows. Area of study: Galicia (Northwestern Spain). Material and methods: Thirty-six Danbred sows were assigned to three experimental groups (n=12) receiving, from day 1 to 30 of pregnancy, 2.5, 3.0 or 3.5 kg/d of a standard diet (8.83 MJ net energy and 138.5 g crude protein/kg). In each group, the number of sows in the second-, third-and fourth-cycle was the same. All animals received, of the same diet, 2.5 kg/d from day 31 to 90 and 3.0 kg/d from day 91 to 107. Seven days prior the parturition, sows were moved to the farrowing-lactating facilities where spent until weaning receiving a common standard lactation diet. At 24 h post-farrowing, litters were standardized to 13 piglets each by cross-fostering. Main results: The optimal feeding level during the first 30 days of gestation was 3.0 kg/d because a lower amount penalized their body weight gain and a higher amount did not improve their fatty reserves. It is worth considering that the increase from 2.5 to 3.5 kg/d generated advantages at birth (higher and more homogenous piglet weights) but also handicaps (lower litter size). The effects were similar irrespective of the cycle number. Research highlights: Different feeding levels during the early pregnancy were tested because it is a critical period. Suppling 3.0 kg/d carried out the best productive and reproductive implications. info:eu-repo/semantics/openAccess by http://creativecommons.org/licenses/by/3.0/es/ 1.238 2020 AGRICULTURE, MULTIDISCIPLINARY 31 / 58 = 0.534 2020 Q3 T2 0.337 2020 Agronomy and Crop Science 2020 Q3 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion De Palo, P. Lorenzo, J.M. Maggiolino, A. González, P. Pérez-Ciria, L. Universidad de Zaragoza Latorre, M.A. Universidad de Zaragoza (orcid)0000-0002-3005-2675 2008 700 Universidad de Zaragoza Dpto. Produc.Animal Cienc.Ali. Área Producción Animal 18, 2 (2020), 1-12 Span. j. agric. res. Spanish Journal of Agricultural Research 1695-971X 197671 http://zaguan.unizar.es/record/95815/files/texto_completo.pdf Versión publicada 469964 http://zaguan.unizar.es/record/95815/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:95815 articulos driver 2021-09-02-10:10:25 ARTICLE