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Effect of prostaglandin f 2 alpha on sow and litter performance during and following parturition

, : Effect of prostaglandin f 2 alpha on sow and litter performance during and following parturition. Journal of Animal Science 44(1): 89-94

Three experiments were conducted to determine the performance of the sow and litter after induction of parturition by PGF2.alpha. [prostaglandin F2.alpha.]. Pregnant crossbred gilts (48) were assigned to 1 of 3 treatments: 0, 5, or 10 mg of PGF2.alpha. during 2 successive farrowings. Injections of PGF2.alpha. (THAM [tris (hydroxymethyl) methylamine] salt or free acid) were given i.m. on day 111 of gestation (day 0 = first day of estrus) during 2 successive farrowings. Constant observation was maintained to record the interval from injection until birth of the 1st pig, interval between births, total farrowing time, occurrence of stillbirths and mummified fetuses. The mean interval (h) from injection until birth of the 1st pig and the total time required for farrowing (h) for gilts receiving 0, 5, or 10 mg PGF2.alpha. THAM salt were, respectively: 105 .+-. 7.5, 4.4 .+-. 7.7, 82 .+-. 14, 4.1 .+-. .6, 90.8 .+-. 15.5, 3.0 .+-. .8. The same intervals for gilts receiving the free acid form of PGF2.alpha. were, respectively: 75.2 .+-. 9.5, 4.3 .+-. .7, 51.9 .+-. 8.3, 3.4 .+-. .5, 65.8 .+-. 11.4, 3.8 .+-. 1 for the 0, 5, and 10 mg treatments. No significant differences between treatments were found due to either form of PGF2.alpha. Rectal temperatures 30 min after injection likewise were not significantly influenced by PGF2.alpha. Temperature increase was greatest, although not significant (P > .10) in gilts receiving 10 mg PGF2.alpha. regardless of formulation. Difficulty during parturition was encountered across all treatments. For both acid and THAM salt forms of PGF2.alpha. the percentage of gilts experiencing problems for 0, 5, and 10 mg treatments was, respectively: 15.4, 18.8, 12.5; 18.8, 12.5, 18.8. The number of live pigs at birth, birth weight, survival, and weight at weaning was not affected by PGF2.alpha. In addition, of the sows retained for rebreeding which returned to estrus, all but 1 control and 2 receiving 5 mg PGF2.alpha. returned to estrus within 7 days following weaning. In a 3rd experiment, 24 pregnant crossbred gilts were assigned to treatments in a 2 .times. 2 factorial design. This study evaluated the effect of volume of diluent (1 or 3 ml) and a single dose of 10 mg PGF2.alpha. vs. 2 injections of 5 mg PGF2.alpha., 12 h apart, on the occurrence of induced parturition. No significant treatment effects were noted. The rate of parturition induction was low. No obvious detrimental effects due to PGF2.alpha. were observed.

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