Effect of recombinant bovine somatotropin on pregnancy rates of Nellore cows resynchronized with the use of new DIB and third use, and inseminated at fixed-time
Journal Title: JOURNAL OF ADVANCES IN AGRICULTURE - Year 2015, Vol 4, Issue 1
Abstract
The objective of the experiment was to evaluate the effects of recombinant bovine somatropin (rbST), and the reuse of the progesterone (P4) releasing devices in resynchronization, on the pregnancy rates of Nellore cows submitted to fixed-time artificial insemination. A group of 123 multiparae Nellore cows, was submitted to a resynchronization protocol: on day 0 a Bovine Intravaginal Device (DIB® ) with 1,0g of P4 was implanted, associated with intramuscular administration of 2,0mg of estradiol benzoate (IM); on day 8 DIB was removed; and 1,0mg of estradiol cypionate, 0,15mg of prostaglandin F2? and 300 UI of equine chorionic gonadotropin were administered; on day 10, fixed-time artificial insemination was conducted (FTAI). The cows were randomized into G1 (n=12) – without rbST / with used Bovine Intravaginal Device, G2 (n=50) – without rbST / with new DIB, G3 (n=11) - with rbST / with used DIB and G4 (n=50) – with rbST/ with new DIB. rbST was introduced on the eighth day of the protocol. Sixty days after TAI, pregnancy diagnoses were conducted, via rectal palpation. Blood samples were taken on day 0, 8 and 10 of the protocol, in order to assess P4 plasma concentrations. Pregnancy rates were statistically evaluated through Generalized Linear Models Theory and their significance was tested with Analysis of Deviance. Pregnancy rates were 58%, 40%, 81% and 48% for G1, G2, G3 and G4, respectively, with significant statistical difference for G3. Plasma concentrations of P4 were not statistically different among groups, or collections. In view of the results obtained, we concluded that the administration of rbST in association with P4 DIB, used for the third time, improves pregnancy rates. Estrus resynchronization and re-insemination positively impacted pregnancy rates.
Authors and Affiliations
Josemara Silva Santos, Tania Cavalcante, Francisca Elda Ferreira Dias, Domenica Palomaris Mariano de Souza, Alencariano J. S. Falcão, Mônica Arrivabene, Juliano Franco de Souza, José Adalmir Torres de Sousa, Viviane Mayumi Maruo
Keywords
Related Articles
- EP ID EP652376
- DOI 10.24297/jaa.v4i1.4304
- Views 181
- Downloads 0
Relationships of Selected Endogenous Factors Associated with Direct Somatic Embryogenesis of Coffee (Coffea arabica L.)
Coffee is one of the most important cash crops produced in the world with great economic returns to growers and national gross domestic product. Somatic embryogenesis is a morphogenetic processes leading to plantlet rege...
SUGAR BEET YIELD AND QUALITY AS AFFACTED BY WATER REGIME BEFOR HARVEST, DENSITY AND SOME CULTIVARS IN NEW RECLAIMED SOILS.
Field experimental was carried out at Kalabsho - El-Dakhlia Governorate, Egypt,  in 2013/14 and 2014/2015 winter growing seasons. To study effect of last regime irrigation before harvest by 15 and 30 days and spacing...
Profitability and Efficiency Analyses of Small Scale Rice processing units in Ngoketunjia Division, North West Region, Cameroon.
Rice production and processing over the years has been on an increase with more small holders entering the business. This study on profitability of processing and marketing of small scale rice processors had as objective...
Response of different bean genotypes to soil nutrients and water in the semi-arid areas of eastern Kenya
Beans (Phaseolus vulgaris L.) are important legumes in the semi-arid areas of Eastern Kenya. But their production is constrained by water stress within the season and between seasons. A field trial was conducted in the s...
Insemination of dairy goats with estrus induced by the male effect during rainy and dry seasons in Northeastern Brazil
This study aimed to evaluate the efficiency of biostimulation (Male Effect) through kidding rate of artificially inseminated goats during rainy (March-April) and dry (August-September) seasons of 2012 at Ceara, Brazil. T...