Uterine Environment and Breed: RESULTS(1)

Fetal and Corpora Lutea Numbers and Fetal Survival Percentages

In the interest of brevity, only results with a significant relationship are presented in the Results section. Fetal number was higher (p < 0.01) in INT vs. UHO but did not differ between INT and MS (p > 0.05; Table 1). Corpus luteum numbers were higher (p < 0.01) on Day 24 and Day 30 than on Day 40, and they were higher (p < 0.01) for MS gilts than for WC gilts (Table 1). No overall effect of day, treatment, or their interaction was observed for fetal survival percentage (Table 1). However, single degree-of-freedom contrasts indicated that an interaction (p < 0.05) was present between intact uterine environments (WC INT and MS combined) vs. UHO, and Day 24 and Day 30 combined vs. Day 40. This interaction was due to decreased fetal survival on Day 40 in UHO gilts. Buy Asthma Inhalers Online

Fetal, Fetal Liver, and Placental Weights

Fetal, fetal liver, and placental weights all increased (p< 0.01) with day of gestation (Table 2). Fetal weights were higher (p < 0.01) in WC than MS and remained higher (p< 0.01) when placental weight was the covariate. Placental weights did not differ according to treatment when ANO-VA was used without covariate analysis, but they were higher (p < 0.01) in MS than in WC when fetal weight was used as a covariate. Fetal liver weights did not differ according to treatment. However, with placental weight as the covariate, fetal liver weight was higher (p < 0.05) in WC than MS on Day 24. This difference disappeared when both placental and fetal weights were used as covariates.
TABLE 1.
Table1Uterine environment
a Least-squares means ± SEM; number of pregnant gilts in parentheses. b Fetal number was greater (p < 0.01) in INT vs. UHO. c CL numbers were greater (p < 0.01) on Day 24 or Day 30 than on Day 40 and were greater (p < 0.01) for MS gilts than for WC gilts. d Single degree of freedom interaction contrasts indicated that an interaction was present (p < 0.05) between WC INT and MS combined vs. UHO and on Day 24 and Day 30 combined vs. Day 40.

TABLE 2.
Table2Uterine environment
a Least-squares means ± SEM; number of pregnant gilts in parentheses.
b Fetal weights increased (p < 0.01) with day of gestation and were greater (p < 0.01) in WC than in MS; fetal weights were greater (p < 0.01) in WC vs. MS with placental weight as covariate.
c Fetal liver weights increased (p < 0.01) with day of gestation; fetal liver weight was greater (p < 0.05) in WC vs. MS on Day 24 with placental weight as covariate.
d Placental weights increased (p < 0.01) with day of gestation; placental weight was greater (p < 0.01) in MS vs. WC with fetal weight as a covariate.

TABLE 3. Hematological measures: fetal.-1
Table3Uterine environment
a Least-squares means ± SEM; number of pregnant gilts in parentheses. b Red blood cells increased (p < 0.01) with day of gestation.
c Percent hematocrit increased (p < 0.01) with day of gestation and was greater (p < 0.01) in WC than in MS. d Hemoglobin concentrations increased (p < 0.01) with day of gestation.
e EPO (plasma erythropoietin) levels were greater (p < 0.01) on Day 30 than on Day 40 and were greater (p < 0.01) in WC than in MS.

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