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Abstract

The use of artificial insemination in cows makes possible breeding of superior animals, which are known as enhancer individuals. However, the major limitation for its expansion has been the necessity for estrus detection. Thus, programs of fixed time artificial insemination (FTAI), without the...

Author(s)
Cavalieri, F. L. B.; Colombo, A. H. B.; Andreazzi, M. A.; Gonçalves, É. A.
Publisher
Universidade Federal do Paraná, UFPR, Palotina, Brazil
Citation
Archives of Veterinary Science, 2016, 21, 1, pp 25-31
Abstract

This study aimed to assess characteristics of bovine cryopreserved sperm and evaluate its relation to field fertility in fixed-time artificial insemination (FTAI). Semen samples of 16 bulls were used to inseminate 811 Nellore cows, and four of these bulls were also used to inseminate 101 Nellore...

Author(s)
Okano, D. S.; Penitente Filho, J. M.; León, V. E. G.; Maitan, P. P.; Silveira, C. O.; Waddington, B.; Díaz-Miranda, E. A.; Costa, E. P. da; Guimarães, S. E. F.; Guimarães, J. D.
Publisher
Wiley, Berlin, Germany
Citation
Reproduction in Domestic Animals, 2019, 54, 3, pp 604-612
Abstract

The objective of this study was to compare the presence of ovarian activity and pregnancy rates to temperature variation at the vulvar skin measured by infrared thermography (IRT). In addition, we also aimed to evaluate the IRT as a non-invasive method to evaluate animal breeding from fixed timed ...

Author(s)
Radigonda, V. L.; Pereira, G. R.; Favaro, P. da C.; Barca Júnior, F. A.; Borges, M. H. F.; Galdioli, V. H. G.; Koetz Júnior, C.
Publisher
Springer, Amsterdam, Netherlands
Citation
Tropical Animal Health and Production, 2017, 49, 8, pp 1787-1791
Abstract

The aim of this study was to compare the use of artificial insemination in time blocks (Artificial Insemination Blocks, AIB) using an 8 and 9 d estradiol-progesterone based protocol. In this experiment, lactating Nelore cows (n=253) were subjected to two estradiol-progesterone based TAI protocols....

Author(s)
Pfeifer, L. F. M.; Castro, N. A.; Neves, P. M. A.; Cestaro, J. P.; Schneider, A.
Publisher
Elsevier B. V., Amsterdam, Netherlands
Citation
Animal Reproduction Science, 2017, 181, pp 125-129
Abstract

This study had the aim of investigating the efficiency of timed artificial insemination (TAI) through the progesterone-releasing intravaginal device (PRID), used in new condition and for the second and third times in Nelore cows. The effects of device reuse and body condition score (BCS) on the...

Author(s)
Pereira, L. L.; Ferreira, A. P.; Vale, W. G.; Serique, L. R.; Neves, K. A. L.; Morini, A. C.; Monteiro, B. M.; Minervino, A. H. H.
Publisher
Wiley, Berlin, Germany
Citation
Reproduction in Domestic Animals, 2018, 53, 3, pp 624-628
Abstract

The objective of this trial was to evaluate different post-timed artificial insemination (TAI) reproductive managements in postpartum beef cows to produce crossbred calves from artificial insemination (AI). Nellore cows (n=607), with 45 days postpartum, were inseminated at a fixed time, using a...

Author(s)
Rodrigues, W. B.; Jara, J. do P.; Borges, J. C.; Oliveira, L. O. F. de; Abreu, U. P. G. de; Anache, N. A.; Silva, K. C. da; Bezerra, A. de O.; Cardoso Junior, C. T.; Nogueira, E.
Publisher
CSIRO, Collingwood, Australia
Citation
Animal Production Science, 2019, 59, 2, pp 225-231
Abstract

This study aimed to evaluate the reproductive performance of heifers aged ≤15 months versus ≥27 months heifers using fixed-time artificial insemination protocols (TAI). Ninety-two crossed beef heifers (Red Angus × Nellore) were surveyed divided into two categories by age range: animals 15 months...

Author(s)
Gassenferth, G.; Talini, R.; Kozicki, L. E.; Pedrosa, V. B.; Segui, M. S.; Cruz, F. B.
Publisher
Universidade Federal do Paraná, UFPR, Palotina, Brazil
Citation
Archives of Veterinary Science, 2016, 21, 4, pp 123-130
Abstract

The objective of the present research was to evaluate the effect of a calf's genetic group on the productive and reproductive efficiency of its Nellore dam. Fixed-time artificial insemination was applied to 800 cows using semen extracted from Nellore, Simmental and Angus Red bulls. Four hundred...

Author(s)
Rodrigues, W. B.; Wechsler, F. S.; Nogueira, E.
Publisher
Wiley-Blackwell, Berlin, Germany
Citation
Reproduction in Domestic Animals, 2015, 50, 3, pp 431-436
Abstract

The aim of this study was to evaluate the reproductive performance of 411 Nellore cows (198 nulliparous, 80 primiparous, and 133 multiparous) submitted to the 5dCO-Synch+P4 or 7dEB+P4 systems. The 5dCO-Synch+P4 system consisted of insertion of an intravaginal progesterone (P4) insert and 100 µg of...

Author(s)
Ferraz Junior, M. V. C.; Pires, A. V.; Biehl, M. V.; Santos, M. H.; Barroso, J. P. R.; Gonçalves, J. R. S.; Sartori, R.; Day, M. L.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2016, 86, 8, pp 1939-1943
Abstract

This study aimed to evaluate the effects of animal category (early two years old primiparous, three years primiparous and multiparous cows) on interval duration between the onset of breeding season (BS) and conception, number of inseminations per female and pregnancy rate at the end of BS. Animals...

Author(s)
Resende, A. O.; Campos, C. C.; Oliveira, M.; Santos, R. M. dos
Publisher
Universidade Federal do Paraná, UFPR, Palotina, Brazil
Citation
Archives of Veterinary Science, 2014, 19, 3, pp 47-52

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