Effects of estrous expression and intensity of behavioral estrous symptoms on variables associated with fertility in beef cows treated for fixed-time artificial insemination

Oosthuizen, Nicola; Cooke, Reinaldo F; Schubach, Kelsey M; Fontes, P. L. P.; Brandão, Alice; Filho, R.V. Oliveira; Colombo, Eduardo; Franco, Gessica A; Reese, Sydney T; Pohler, Ky G; Lamb, G. C.

doi:10.1016/j.anireprosci.2020.106308

Cited by 18 publications

(13 citation statements)

References 42 publications

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“…The results of the present study confirmed these explanations since cows fed TMR with the highest CP concentration of 9.17% (C3) did not show different estrous signs but increase estrous percentage because the TDN (58.18%) and CP (9.17%) contents of the ration at T3 treatment are the most appropriate nutrient requirement for postpartum beef cattle according to NRC (2000). To date, the mechanisms on how nutritional factors modulate estrous expression are still unknown (Oosthuizen et al, 2020). Therefore, further investigation in this area is required to be done.…”

Section: Discussionmentioning

confidence: 99%

Estrous Signs and Progesterone Profile of Ongole Grade Cows Synchronized at Different Ages Fed Different Level of Dietary Crude Protein

Hayati¹,

Panjono

Irawan

2021

Trop. Anim. Sci. J.

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This study aimed to evaluate the effects of concentrate supplementation containing different protein levels on estrous signs and progesterone profiles of two age groups of Ongole Grade cow. Thirty females cows were grouped according to their ages (G1= 25±1.6 months; G2= 37±1.7 months), where each group received 3 dietary treatments with 5 replicates. The dietary treatment was based on CP levels of total mixed ration (TMR) (T1= 7.41% CP; T2= 8.23% CP; and T3= 9.17% CP). The cows were synchronized using PGF2α and GnRH, followed by time-fixed artificial insemination (TAI) using frozen semen. Data on nutrient intake and progesterone concentration were subjected to a randomized complete block design of ANOVA following a factorial arrangement of 2×3 while data of estrous signs were analyzed using non-parametric methods of Kruskal-Wallis and independent t-test. The results showed that there was a significant interaction effect between age group and dietary TMR treatment on CP intake and TDN intake in which the highest intakes were found in older cows (G2) fed TMR at 7.41% CP (T1) (p<0.01). Dry matter intake (DMI) was not affected either by age group or level of concentrate supplementation. Results also suggested that estrous signs, including vulva redness, swollen vulva, and mucus discharge, were higher in older cows (G2) than in younger cows (G1). In addition, interactions were also found on progesterone levels, whereas younger cows (G1) fed TMR with 9.17% CP (T3) showed the highest concentration of progesterone on d 5, 17, and 21 (p<0.01). In conclusion, this study suggests that younger cows receiving the highest CP diet (T3) result in higher progesterone concentration during the experimental period. Therefore, it is important to fed sufficient dietary CP especially for cattle in early reproduction period to optimize the reproductive performance.

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Section: Discussionmentioning

confidence: 99%

Estrous Signs and Progesterone Profile of Ongole Grade Cows Synchronized at Different Ages Fed Different Level of Dietary Crude Protein

Hayati¹,

Panjono

Irawan

2021

Trop. Anim. Sci. J.

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“…Pregnancy rates to TAI are greater in cows and heifers that express estrus before TAI, where PR/AI between 11% and 43% greater have been reported ( Perry et al, 2007 ; Richardson et al, 2016 ; Oosthuizen et al, 2020 , 2021 ). Therefore, it was expected that PR/AI in the present experiment would be greater in heifers that expressed estrus when compared with those that did not express estrus.…”

Section: Discussionmentioning

confidence: 90%

Effects of prolonging the interval from progestin removal to prostaglandin F2α injection from 16 to 17 d in a long-term estrus synchronization protocol in beef heifers

Oosthuizen

Melo

Seidel

et al. 2021

Translational Animal Science

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To determine effects of delaying the injection of prostaglandin F2α (PGF) and fixed-time artificial insemination (TAI) in the 14-d CIDR-PG protocol, 1,049 Angus heifers at six locations were enrolled in a completely randomized design. Within location heifers were randomly assigned to one of two treatment groups: 1) PG16 (n = 518), heifers received a controlled internal drug release (CIDR) insert on d 0 for 14 d, a 25-mg injection of PGF 16 d after CIDR removal (Day 30), and a 100-µg injection of gonadotropin-releasing hormone concurrent with TAI 66 ± 2 h later; or 2) PG17 (n = 531), heifers were treated the same as PG16, however, PGF was administered 17 d after CIDR removal (Day 31), and heifers were TAI 66 ± 2 h later. Estrus detection patches were applied to a subset (n = 482) of heifers at the time of PGF administration and were examined for activation at TAI. Dominant follicle diameter was determined via transrectal ultrasonography at PGF administration and TAI in a subset of heifers (n = 116). Transrectal ultrasonography was performed to determine pregnancy rates to TAI (PR/AI) between 30 and 45 d after TAI. Estrus expression prior to TAI differed by treatment where PG17 heifers had greater (P < 0.01) expression of estrus than PG16 heifers (57.8 ± 6.1 vs. 43.4 ± 6.1%, respectively). Nevertheless, dominant follicle diameters at PGF and at TAI were similar (P ≥ 0.59) between PG16 and PG17 heifers. In addition, PR/AI did not differ (P = 0.29) between PG16 and PG17 treatments (50.5 ± 3.2 vs. 45.7 ± 3.1%, respectively). Results of this experiment indicate that delaying the injection of PGF and TAI in the 14-day CIDR-PG protocol increased estrus expression prior to TAI yet did not improve fertility in beef heifers.

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“…This report demonstrates that the weight gain, between insemination and the pregnancy diagnosis, influences on pregnancy rates obtained by FTAI. However, even the weight gain being related to the IGF-I concentrations, as previously described, the effective mechanism that the weight gain exercised on the success of pregnancy rates in cows subjected to FTAI has not yet been fully clarified (Oosthuizen et al, 2020), therefor further studies are needed.…”

Section: Discussionmentioning

confidence: 97%

“…The Fixed Time Artificial Insemination (FTAI) is an extremely useful tool in livestock, since it optimizes reproductive management (Baruselli et al, 2017;Bó et al, 2018). In such a way, this biotechnology provides the insemination of cows at the beginning Development, v. 9, n. 9, e907998091, 2020 (CC BY 4.0) | ISSN 2525-3409 | DOI: http://dx.doi.org/10.33448/rsd-v9i9.8091 of the breeding season, regardless of the cyclical state and thus eliminates the need for estrus detection and ensures greater genetic gain to the herd and profitability to livestock (Baruselli, Reis, Marques, Nasser, & Bó, 2004;Oosthuizen et al, 2020;Taponen, 2009).…”

Section: Introductionmentioning

confidence: 99%

Influence of nutritional and ovarian parameters on pregnancy rates of Nelore cows artificially inseminated at fixed time

Negreiros

Seugling

Almeida

et al. 2020

RSD

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This experiment aimed to evaluate the effect of weight gain, body condition score and antral follicle count on the fertility of cows subjected to fixed-time artificial insemination. To this study, it was used 194 Nelore, pluriparous cows, between the 30th and the 45th day of the postpartum period. The cows were weighed, was classified by the body condition score and a transrectal ultrasound was performed in the ovaries to identify the corpus luteum and for counting the antral follicles. Then, the females were submitted to a hormonal protocol to perform the artificial insemination in fixed time. Thirty days after the artificial insemination, the cows were weighed again and the pregnancy was diagnosed by transrectal ultrasound. The pregnancy rate did not interact (P>0.05) with the body score condition, nor the presence of the corpus luteum, neither with the antral follicles count. The weight gain between the artificial insemination moment and the pregnancy diagnosis showed an interaction (P = 0.02) with the pregnancy rate. The weight gain average between the FTAI and the pregnancy diagnosis was 9.0 kg. The animals that gained up to 73 kg, showed higher pregnancy rate. In conclusion, the weight gain between the artificial insemination in fixed time and the pregnancy diagnosis influenced the pregnancy rate.

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Effects of estrous expression and intensity of behavioral estrous symptoms on variables associated with fertility in beef cows treated for fixed-time artificial insemination

Cited by 18 publications

References 42 publications

Estrous Signs and Progesterone Profile of Ongole Grade Cows Synchronized at Different Ages Fed Different Level of Dietary Crude Protein

Estrous Signs and Progesterone Profile of Ongole Grade Cows Synchronized at Different Ages Fed Different Level of Dietary Crude Protein

Effects of prolonging the interval from progestin removal to prostaglandin F2α injection from 16 to 17 d in a long-term estrus synchronization protocol in beef heifers

Influence of nutritional and ovarian parameters on pregnancy rates of Nelore cows artificially inseminated at fixed time

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