Resumption of Post‐partum Ovarian Activity Monitored by Plasma Progesterone in Anoestrous Zebu (Bos indicus) Cattle Following Temporary Weaning and Progestogen Treatment

Bolaños, J. M.; Galina, C.S.; Estrada, Sandra; Forsberg, M.

doi:10.1111/j.1439-0531.1997.tb01293.x

Cited by 8 publications

(3 citation statements)

References 19 publications

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“…In contrast, a major feature was the number of cows ovulating but not displaying estrus, which amounted to around 20% of the cows. This result is in accordance with previous reports in Zebu cattle indicating that approximately one-fifth of cows do not exhibit overt signs of estrus [ 18 , 19 , 20 ]. In fact, Mukasamugerwa et al .…”

Section: Discussionsupporting

confidence: 93%

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

Rubio

Corro

et al. 2015

Journal of Reproduction and Development

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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.

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Section: Discussionsupporting

confidence: 93%

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

Rubio

Corro

et al. 2015

Journal of Reproduction and Development

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“…Webb et al [54] used the same approach but separating the calves for 72 h with only visual contact and reported an increase in the number of animals cycling. Bolaños et al [92] found that pharmacologically inducing estrous treatment could enhance the percentage of postpartum cows displaying behavioral estrus whether or not the calf was separated for 48 h but were unable to achieve cyclicity in about 50% of those cows treated. These conflicting results could be explained by the experiments of Pérez-Torres et al [51] who compared the reproductive response of separation for 24 h, 48 h, and 72 h. The variability of the response at 48 h seems to be the cause of differences in relation to testing reproductive efficiency.…”

Section: Weaning Methodsmentioning

confidence: 99%

Effects of Separation of Cows and Calves on Reproductive Performance and Animal Welfare in Tropical Beef Cattle

Orihuela

Galina

2019

Animals

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Nursing a calf suppresses postpartum ovarian activity prolonging the period of anestrus. Diverse methods are used to reduce the effect of suckling; the most popular, restricted suckling, reduces the number of encounters mother-calf. Temporal weaning of the calf for periods of 24 h, 48 h, or even 72 h also suppress the effect of suckling and is commonly applied to cow-calf operations in the tropics. Early weaning of the calf, usually three to five months after birth, is a practice gaining popularity over the traditional system of weaning at seven months. Furthermore, the use of nose-flaps in the calf to avoid suckling is a common procedure in South America. Finally, weaning during the first week after calving is an established method to reduce postpartum anestrus. The objective of the present review is to discuss the effects of these methods on the reproductive performance of beef cattle and their animal welfare implications.

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“…This crossing is carried out to improve the productivity of milk production systems under tropical conditions since Zebu breeds exhibit excellent adaptations to these conditions, whereas purebred animals of specialized breeds have serious adaptation problems under the same conditions [ 42 ]. However, although the duration of the estrus cycle is similar between taurine and zebuine breeds, the estrus period is shorter in Zebu females [ 43 ]. Furthermore, estrus occurs in Dairy Gyr cows mainly between the beginning of the night and early morning hours, a fact that can impair the detection of estrus by the producer [ 7 ].…”

Section: Discussionmentioning

confidence: 99%

Estrus Prediction Models for Dairy Gyr Heifers

Andrade

Bernardes

Vicentini

et al. 2021

Animals

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Technological devices are increasingly present in livestock activities, such as identifying the reproductive status of cows. For this, predictive models must be accurate and usable in the productive context. The aims of this study were to evaluate estrus-associated changes in reticulo-rumen temperature (RRT) and activity (ACT) in Dairy Gyr heifers provided by reticulo-rumen boluses and to test the ability of different models for estrus prediction. The RRT and ACT of 45 heifers submitted to estrus synchronization were recorded using reticulo-rumen boluses. The means of RRT and ACT at different time intervals were compared between the day before and the day of estrus manifestation. An analysis of variance of RRT and ACT was performed using mixed models. A second approach employed logistic regression, random forest, and linear discriminant analysis models using RRT, ACT, time of day, and the temperature-humidity index (THI) as predictors. There was an increase in RRT and ACT at estrus (p < 0.05) compared to the same period on the day before and on the day after estrus. The random forest model provided the best performance values with a sensitivity of 51.69% and specificity of 93.1%. The present results suggest that RRT and ACT contribute to the identification of estrus in Dairy Gyr heifers.

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Resumption of Post‐partum Ovarian Activity Monitored by Plasma Progesterone in Anoestrous Zebu (Bos indicus) Cattle Following Temporary Weaning and Progestogen Treatment

Cited by 8 publications

References 19 publications

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

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

Effects of Separation of Cows and Calves on Reproductive Performance and Animal Welfare in Tropical Beef Cattle

Estrus Prediction Models for Dairy Gyr Heifers

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