Influence of pig substitution on milk yield, litter weights, and milk composition of machine milked sows.

摘要: This study was conducted to 1) determine milk yield of sows that were machine milked up four times daily; 2) the effect pig substitution on yield; 3) assess litter weight changes for are milked; and 4) composition. Eight daily d 51 postpartum. Sows either maintained their own or had a week-old replacement replace 25-d-old pigs. Individual gland yields obtained random days throughout lactation, different diameter weighted teat cups rotated so all glands received combinations. Composite samples analyzed fat, protein, somatic cells. Milk peaked at about 19 postpartum declined 45 in with litter, whereas earlier more dramatic decline after fostering younger litter. Litter weights 17.1 +/- 1.0 kg farrowing 13.6 .6 pigs born alive. Final 34.4 11.7 litters 74.4 13.5 litters, numbers weaned 6.5 1.3 9.7 1.5, respectively. fat influenced by route oxytocin administration (6.53 .12 i.v. vs 7.21 .19% i.m. administration; P < .05). percentage highest 2 13 protein time day milking (lowest fourth milking, 5.57 .11%) followed pattern similar fat. affected linear manner yield, associated lowest yields. Somatic cells (P .05) .01). There increase from 8 x 10(6) cells/mL than 12 These results show affects amount obtained. Moreover, composition lactation. However, removal has severe impact gains, systems where sow's is needed commercial purposes, supplementation necessary.