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A pre-synchronization program at early postpartum might increase the chances of Bos indicus cows cycling prior to 50 days regardless of the length of calf separation.

Pérez-Torres L, Rubio I, Corro M, Cohen A, Orihuela A, Galina CS, Pablos JL - J. Reprod. Dev. (2015)

Bottom Line: The average BFT and body condition score for the four experimental groups in the two periods were similar (P >0.05).Animals with a higher proportion of follicles from 17 to 21 mm, BFT values above 3.5 mm and a regular body condition were significantly different regardless of whether the dams remained with their calves or were separated, regardless of the length of this event.It can be concluded that (1) a pre-synchronization program at day 25 could trigger the onset of ovarian activity and facilitate a breeding program at day 50 and (2) temporary weaning enhances the effect of a pre-synchronization program.

View Article: PubMed Central - PubMed

Affiliation: Facultad de Ciencias Agropecuarias, Universidad Autónoma del Estado de Morelos, Morelos 62210, México.

ABSTRACT
The aim of this study was to establish if pre-synchronization would enhance the number of animals cycling prior to conventional breeding at 45 days irrespective of the length of calf separation. Multiparous Bos indicus cows were allotted in four groups (n = 10). Control group (C) dams remained with their calves; groups G24, G48 and G72, which were partially weaned for 24, 48 and 72 h, respectively, were estrus synchronized using a controlled internal drug. These procedures were performed at 25 days and again at 45 days postpartum. The number of follicles, presence of a corpus luteum and back fat thickness (BFT) were determined by ultrasound. The proportion of cows with estrus and ovulation at day 25 postpartum was statistically different between the control and treated groups, with the values being 20, 60, 50 and 70 for the control, G24, G48 and G72 groups respectively (P < 0.05). At days 45 postpartum, the proportion of cows with estrus and ovulation was different in group G48 compared with the other groups (P <0.05). The average BFT and body condition score for the four experimental groups in the two periods were similar (P >0.05). Animals with a higher proportion of follicles from 17 to 21 mm, BFT values above 3.5 mm and a regular body condition were significantly different regardless of whether the dams remained with their calves or were separated, regardless of the length of this event. It can be concluded that (1) a pre-synchronization program at day 25 could trigger the onset of ovarian activity and facilitate a breeding program at day 50 and (2) temporary weaning enhances the effect of a pre-synchronization program.

No MeSH data available.


Related in: MedlinePlus

Follicular diameters of cows at days 25 and 45 postpartum. The black bars represent follicles from females with theoretical ovulatory capacity. 1,2,3 Different numbers represent differences in follicular categories among groups at P ˂ 0.05. a,b Different letters indicate differences between follicular categories between 25 and 45 days postpartum at P < 0.05.
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fig_001: Follicular diameters of cows at days 25 and 45 postpartum. The black bars represent follicles from females with theoretical ovulatory capacity. 1,2,3 Different numbers represent differences in follicular categories among groups at P ˂ 0.05. a,b Different letters indicate differences between follicular categories between 25 and 45 days postpartum at P < 0.05.

Mentions: As can be observed in Fig. 1Fig. 1.


A pre-synchronization program at early postpartum might increase the chances of Bos indicus cows cycling prior to 50 days regardless of the length of calf separation.

Pérez-Torres L, Rubio I, Corro M, Cohen A, Orihuela A, Galina CS, Pablos JL - J. Reprod. Dev. (2015)

Follicular diameters of cows at days 25 and 45 postpartum. The black bars represent follicles from females with theoretical ovulatory capacity. 1,2,3 Different numbers represent differences in follicular categories among groups at P ˂ 0.05. a,b Different letters indicate differences between follicular categories between 25 and 45 days postpartum at P < 0.05.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4498368&req=5

fig_001: Follicular diameters of cows at days 25 and 45 postpartum. The black bars represent follicles from females with theoretical ovulatory capacity. 1,2,3 Different numbers represent differences in follicular categories among groups at P ˂ 0.05. a,b Different letters indicate differences between follicular categories between 25 and 45 days postpartum at P < 0.05.
Mentions: As can be observed in Fig. 1Fig. 1.

Bottom Line: The average BFT and body condition score for the four experimental groups in the two periods were similar (P >0.05).Animals with a higher proportion of follicles from 17 to 21 mm, BFT values above 3.5 mm and a regular body condition were significantly different regardless of whether the dams remained with their calves or were separated, regardless of the length of this event.It can be concluded that (1) a pre-synchronization program at day 25 could trigger the onset of ovarian activity and facilitate a breeding program at day 50 and (2) temporary weaning enhances the effect of a pre-synchronization program.

View Article: PubMed Central - PubMed

Affiliation: Facultad de Ciencias Agropecuarias, Universidad Autónoma del Estado de Morelos, Morelos 62210, México.

ABSTRACT
The aim of this study was to establish if pre-synchronization would enhance the number of animals cycling prior to conventional breeding at 45 days irrespective of the length of calf separation. Multiparous Bos indicus cows were allotted in four groups (n = 10). Control group (C) dams remained with their calves; groups G24, G48 and G72, which were partially weaned for 24, 48 and 72 h, respectively, were estrus synchronized using a controlled internal drug. These procedures were performed at 25 days and again at 45 days postpartum. The number of follicles, presence of a corpus luteum and back fat thickness (BFT) were determined by ultrasound. The proportion of cows with estrus and ovulation at day 25 postpartum was statistically different between the control and treated groups, with the values being 20, 60, 50 and 70 for the control, G24, G48 and G72 groups respectively (P < 0.05). At days 45 postpartum, the proportion of cows with estrus and ovulation was different in group G48 compared with the other groups (P <0.05). The average BFT and body condition score for the four experimental groups in the two periods were similar (P >0.05). Animals with a higher proportion of follicles from 17 to 21 mm, BFT values above 3.5 mm and a regular body condition were significantly different regardless of whether the dams remained with their calves or were separated, regardless of the length of this event. It can be concluded that (1) a pre-synchronization program at day 25 could trigger the onset of ovarian activity and facilitate a breeding program at day 50 and (2) temporary weaning enhances the effect of a pre-synchronization program.

No MeSH data available.


Related in: MedlinePlus