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
Effect of Surfactant Compound Sprays on The Rate of Adsorption on Different Target Surfaces
The first operation of adsorption on leaf surfaces in pulverization is drop sticking. In the water wettability of the surfaces, the sticking of the drops has a great importance. Drop contact angle, contact height, and co...
The Chemical Composition of Egyptian Moringa Oleifera Grown in Different Agro-Ecological Regions
Moringa Oleifera plant is successfully grown in Egypt now their leaves are highly nutritious and can be eaten either fresh or cooked. Aim Evaluate chemical composition of Egyptian Moringa Oleifera leaves grown in differe...
FARMERS PERCEPTION AND THE HIGHLIGHTS OFTHE SOURCES OF THE CHRONIC AFLATOXIN CONTAMINATION AMONGST THE INHABITANTS OF THE SOUTH-EASTERN REGION INKENYA
There are factors that contribute to aflatoxin contamination like conducive ecological zones, stressed crops, virulent Aspergillus strains and unconventional agricultural practices. Kenyans especially in the South-Easter...
Unique Localization of Bovine Viral Diarrhea Virus Non-Structural NS4B Protein in Infected Cells
Bovine viral diarrhea virus (BVDV), an important pathogen infecting ruminants, has 2 biotypes: cytopathic (cp) and noncytopathic (ncp), which are related to the onset of disease. The viral replication complex is composed...
The Effect of Harvesting Time and Variety on Fiber andCottonStalkYield Potential and its Companent for Use in the Pulp andPaperIndustry
Survey of cotton fiber yield, in addition to the identification of its best variety can cause cotton residual enhancement. The remainder of cotton stalk in farms is an illness-causing agent and leads to yield reduction i...