Effect of dosage and duration of altrenogest treatment on follicular development and ovulation in sows

Authors : Supatee KITKHA, Alongkot BOONSOONGNERN, Nattavut RATANAVANICHROJN, Pichai JIRAWATTANAPONG, Anuchai PINYOPUMMIN

Pages : 733-740

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Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :  The aim of this study was to investigate the effect of altrenogest insert ignore into journalissuearticles values(ALT); treatment on follicular development and ovulation in sows. Sows insert ignore into journalissuearticles values(parity 6-9; D0: weaning day); were assigned to four treatments as follows: control insert ignore into journalissuearticles values(no ALT treatment; n = 20);, ALT-4-0 insert ignore into journalissuearticles values(ALT 20 mg/day, 5 days; D-4-D0; n = 20);, ALT-4-2 insert ignore into journalissuearticles values(ALT 20 mg/day, 7 days; D-4-D2; n = 23);, and 2ALT-4-2 insert ignore into journalissuearticles values(ALT 20 mg twice a day [40 mg/day], 7 days; D-4-D2; n = 24);. The sows in each group were further divided into three groups based on slaughter periods: day 1 insert ignore into journalissuearticles values(DF1); and day 4 insert ignore into journalissuearticles values(DF4); of the follicular phase, and after the initiation of estrus. The number of follicles was reduced on DF4 compared to DF1 insert ignore into journalissuearticles values(P < 0.001);. On DF1, follicular size insert ignore into journalissuearticles values(FS); of the control was larger than that of ALT-4-0, ALT-4-2, and 2ALT-4-2, but on DF4, FS of ALT-4-2 and 2ALT-4-2 was larger than that of the control and ALT-4-0 insert ignore into journalissuearticles values(P < 0.001);. The coefficient of variation of FS on DF4 was smaller in ALT-4-2 compared to the control and 2ALT-4-2 insert ignore into journalissuearticles values(P < 0.05);. Ovulation rate was similar between groups insert ignore into journalissuearticles values(P - 0.05);. ALT improved follicular growth and the homogeneity of FS without affecting ovulation.
Keywords : Altrenogest, follicular development, ovulation, periweaning, sow