title: Essential fatty acid supplementation during lactation is required to maximize the subsequent reproductive performance of the modern sow.
abstract: This study was conducted to investigate the effects of supplemental essential fatty acids (EFA) on sow reproductive efficiency and to estimate the concentrations of EFA required by the lactating sow for maximum subsequent reproduction. Data were collected on 480 sows (PIC Camborough) balanced by parity, with 241 and 239 sows representing Parity 1, and 3-5 (P3+), respectively. Sows were assigned randomly, within parity, to a 3 × 3 factorial arrangement plus a control diet without added lipids. Factors included linoleic (2.1%, 2.7%, and 3.3%) and α-linolenic acid (0.15%, 0.30%, and 0.45%), obtained by adding 4% of different mixtures of canola, corn and flaxseed oils to diets. Diets were corn-soybean meal based with 12% wheat middlings. The benefits of supplemental EFA were more evident for the subsequent reproduction of mature P3+ sows. For these sows, supplemental α-linolenic acid improved the proportion of sows that farrowed relative to sows weaned (linear P=0.080; 82.8, 80.5, and 92.8% for sows fed 0.15%, 0.30%, and 0.45% α-linolenic acid, respectively). In addition, supplemental linoleic acid, fed to Parity 1 and P3+ sows, tended to increase subsequent litter size (linear P=0.074; 13.2, 13.8 and 14.0 total pigs born for 2.1%, 2.7% and 3.3% linoleic acid, respectively). These results demonstrate that a minimum dietary intake of both α-linolenic and linoleic acid is required for the modern lactating sow to achieve a maximum reproductive outcome through multiple mechanisms that include rapid return to estrus, increased maintenance of pregnancy and improved subsequent litter size.
authors.affiliation: The Hanor Company, Franklin, KY 42134, USA; Department of Animal Science, North Carolina State University, Raleigh, NC 27695, USA.
authors.forename: David S
authors.initials: DS
authors.lastname: Rosero
authors.affiliation: The Hanor Company, Franklin, KY 42134, USA; Department of Animal Science, North Carolina State University, Raleigh, NC 27695, USA.
authors.forename: R Dean
authors.initials: RD
authors.lastname: Boyd
authors.affiliation: The Hanor Company, Franklin, KY 42134, USA.
authors.forename: Mark
authors.initials: M
authors.lastname: McCulley
authors.affiliation: Department of Animal Science, North Carolina State University, Raleigh, NC 27695, USA.
authors.forename: Jack
authors.initials: J
authors.lastname: Odle
authors.affiliation: Department of Animal Science, North Carolina State University, Raleigh, NC 27695, USA. Electronic address: Eric_vanHeugten@ncsu.edu.
authors.forename: Eric
authors.initials: E
authors.lastname: van Heugten
mesh_terms: D000818:Animals; D003314:Corn Oil / Q000494:pharmacology; D004032:Diet / Q000662:veterinary; D019587:Dietary Supplements; D005228:Fatty Acids, Essential / Q000008:administration & dosage / Q000494:pharmacology*; D005229:Fatty Acids, Monounsaturated / Q000494:pharmacology; D005260:Female; D007774:Lactation / Q000187:drug effects* / Q000502:physiology; D019787:Linoleic Acid / Q000008:administration & dosage / Q000494:pharmacology; D008043:Linseed Oil / Q000494:pharmacology; D011247:Pregnancy; D000074262:Rapeseed Oil; D012098:Reproduction / Q000187:drug effects* / Q000502:physiology; D013552:Swine / Q000502:physiology*; D017962:alpha-Linolenic Acid / Q000494:pharmacology
chemical_list: D005228:Fatty Acids, Essential; D005229:Fatty Acids, Monounsaturated; D000074262:Rapeseed Oil; D017962:alpha-Linolenic Acid; D008043:Linseed Oil; D003314:Corn Oil; D019787:Linoleic Acid
keywords: Essential fatty acids; Lactation; Lipids; Sows; Subsequent reproduction