Intensified use of TAI and sexed semen on commercial farms

Marques, Márcio de Oliveira; Morotti, Fábio; Lorenzetti, Elis; Bizarro-Silva, Camila; Seneda, Marcelo Marcondes

doi:10.21451/1984-3143-ar2018-0070

Cited by 12 publications

(9 citation statements)

References 16 publications

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“…In addition to sanitary and nutritional management, several factors, such as environmental conditions, have a great influence on the reproductive performance of bovine females subjected to TAI (Marques, Morotti, Lorenzetti, Bizarro-Silva, & Seneda, 2018;Rodrigues et al, 2019). In this context, in multiparous Nelore females submitted to the same type of hormonal protocol used in the present study, Crepaldi, Sales, Girotto, Carvalho and Baruselli (2019) obtained a 68.4% pregnancy rate, which was not a significant difference, thereby demonstrating that the environmental conditions were very similar to those in the present study.…”

Section: Resultsmentioning

confidence: 99%

Estrus expression and pregnancy rates in heifers primiparous and multiparous Nelore cows subjected to timed artificial insemination with strategic use of gonadotropin-releasing hormone

Bonato¹,

Filho²,

Santos³

et al. 2021

Semina: Ciênc. Agrár.

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We evaluated the effects of nulliparous, primiparous, and multiparous conditions on the estrus and pregnancy rates in females that did not show estrus but were treated with gonadotropin-releasing hormone (GnRH) at the time of timed artificial insemination (TAI). Nelore females (n = 531) were allocated according to the following categories: nulliparous (n = 144), primiparous (n = 132), and multiparous (n = 255). The animals received a conventional TAI protocol, and estrus expression was identified by the absence of paint in the sacrococcygeal region on the day of TAI. Females that did not show estrus were treated with 10 μg of GnRH together with insemination. The rates of estrus and pregnancy were analyzed using a logistic regression model (P < 0.05). The estrus expression was lower (P = 0.006) in the primiparous (61.36%) group than in the nulliparous (76.39%) and multiparous (75.69%) groups. Similar pregnancy rates were observed in females that showed estrus (nulliparous 84.54%, primiparous 86.42%, and multiparous 80.31%; P = 0.39) and in females that did not show estrus and received GnRH (nulliparous 41.18%, primiparous 56.86%, and multiparous 58.06%; P = 0.24). The total pregnancy rates were also similar (P = 0.98) among the categories (nulliparous 74.3%, primiparous 75.0%, and multiparous 74.9%). The primiparous females had a lower rate of estrus, and the pregnancy rates were similar among the categories that received GnRH.

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Section: Resultsmentioning

confidence: 99%

Estrus expression and pregnancy rates in heifers primiparous and multiparous Nelore cows subjected to timed artificial insemination with strategic use of gonadotropin-releasing hormone

Bonato¹,

Filho²,

Santos³

et al. 2021

Semina: Ciênc. Agrár.

Self Cite

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“…It is believed that technology is a complementary tool and not the only "solution" for improving the pregnancy rate. Many variables must be considered (animal category, inseminator, semen fertility used, synchronization protocol, management, climate, nutrition, and herd health), all commented by Lamb et al (2010) and Marques et al (2018). It can be corroborated with such evidence, since the statistical model used demonstrated that contemporary groups significantly interfere in the question of pregnancy (p < 0.001), demonstrating that a lot can interfere with pregnancy results and, consequently, in the reproductive/productive efficacy of a herd.…”

Section: Profitability Analysis Using Rhgal-1 Managementmentioning

confidence: 99%

Effect of galectin-1 administration on pregnancy rate and its economic viability in TAI procedures in beef cattle

Roncoletta¹,

Morani²,

Penha

et al. 2021

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The purpose of this work is to demonstrate the reproductive efficacy and the economic impact of a complementary tool to the TAI (timed artificial insemination) protocols - the administration of a single dose of recombinant human galectin-1 (rHGAL1) during the insemination procedure. GAL-1 can be considered as a modulator of the pregnancy development process. Reproductive efficacy was verified through the pregnancy rate in the first service, by ultrasonography (at 28-35 days) in contemporary groups (YG) of cows subdivided into 02 experimental groups (Control Group, composed of cows inseminated in a conventional and Treated group, composed of cows inseminated with rHGAL-1 administration following the deposition of the semen dose). Ninety YG were formed, grouping cows under identical conditions (inseminator, farm/lot, breed, animal category, semen/bull variables). The experiment was conducted in 15 farms, with 3,125 cows (Nellore and crossbred), all multiparous and with calf at foot (from 60 to 100 days old) and who maintained a body score (BSC) between 3.5 and 2.5 in the act of the TAI protocol and in the pregnancy diagnosis. It was demonstrated, by the proposed statistical method, that the “rHGAl-1 dose” effect was significant, increasing the probability of obtaining pregnancy by 8.38 percentage points (p < 0.0001). Based on the construction of a hypothetical model, the economic profitability that can be obtained were compared. Using the average increase obtained by 8.38 percentage points more in the pregnancy rate, it was possible to increase productivity, adding, almost U$ 2 thousand to profitability for each 100 cows worked.

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“…Assim, a tecnologia XY (Johnson e Welch, 1999;Garner e Seidel, 2008) Na inseminação artificial com tempo fixo os resultados iniciais demonstraram taxa de prenhez menor (8%) que sêmen convencional (Marques et al, 2018;Thomas et al, 2017), aumento significativo na taxa de prenhez (9%) em comparação a metodologia anterior (Marques et al, 2018) e taxa de concepção semelhante ao sêmen convencional (Crites et al, 2018). Entretanto, os resultados variaram em função do touro (Thomas et al, 2019).…”

Section: Mountunclassified

Viabilidade De Espermatozoides Criopreservados Utilizando Diluidores Não Específicos De Sêmen De Canis Lupus Familiaris

Machado¹,

Soares²,

Campos³

2020

Inovação E Pluralidade Na Medicina Veterinária 3

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Intensified use of TAI and sexed semen on commercial farms

Cited by 12 publications

References 16 publications

Estrus expression and pregnancy rates in heifers primiparous and multiparous Nelore cows subjected to timed artificial insemination with strategic use of gonadotropin-releasing hormone

Estrus expression and pregnancy rates in heifers primiparous and multiparous Nelore cows subjected to timed artificial insemination with strategic use of gonadotropin-releasing hormone

Effect of galectin-1 administration on pregnancy rate and its economic viability in TAI procedures in beef cattle

Viabilidade De Espermatozoides Criopreservados Utilizando Diluidores Não Específicos De Sêmen De Canis Lupus Familiaris

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