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

Time of Fusarium inoculation and post-anthesis temperature stress affect FHB severity and DON concentration in winter wheat

Two pot experiments were conducted using elite lines and near isogenic lines (NILs) of winter wheat in a controlled environment to evaluate the effect of time of inoculation and subsequent increase in temperature during...

The dynamics of physical properties, seed moisture content, market economics and post harvest management of six bean varieties (Phaseolus vulgaris) grown in the sub Saharan region in Africa

Managing grain moisture content is important because maximum economic return can be achieved by marketing at a certain moisture level of grain. Post-harvest management dictates that grains must be dried to certain levels...

Morphological characterization and genetic diversity studies of promising brinjal genotypes for hybridization program in Bangladesh

In this Morphological variation of thirty-five brinjal genotypes was investigated in order to screen efficient genotypes for a hybridization program in Bangladesh. The phenotypic coefficient of variation (PCV) was higher...

The study of important agronomic traits by multivariate analysis in winter rapeseed cultivars

In order to group winter rapeseed cultivars according to evaluated traits, an experiment was conducted in the Research Greenhouse of Agriculture Faculty, University of Tabriz - IRAN. In the experiment were included 12 cu...

ACCEPTABILITY AND UTILIZATION OF GRADED LEVELS OF GMELINA ARBOREA AND CASSAVA PEELS CONCENTRATES IN WEST AFRICAN DWARF SHEEP

The nutritive value ,voluntary dry matter intake, and the nutrient digestibility of graded levels of Gmelina arborea and cassava peels concentrates in WAD sheep was investigated. Twelve WAD sheep aged 1-2 years old and w...

Download PDF file
  • EP ID EP652376
  • DOI 10.24297/jaa.v4i1.4304
  • Views 179
  • Downloads 0

How To Cite

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 (2015). 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 OF ADVANCES IN AGRICULTURE, 4(1), 356-362. https://europub.co.uk/articles/-A-652376