Respuesta superovulatoria en número y calidad embrionaria de vacas y novillas Gyr lechero en clima cálido húmedo
Motta Delgado, Pablo Andrés | 2011-10
Was evaluated a response for quantity and quality of embryos in cows and heifers of dairy Gyr cattle. Were done two treatments with individuals distributed completely at random where heifers (T1, n = 8) and cows (T2, n = 6) were subjected to superovulation protocol (SOV) through of follicular wave synchronization and super-stimulation with 200 mg of p-FSH among the 4 and 7 day of protocol, in the 8 and 9 day was made AI in the afternoon and in the morning respectively. The embryos were collected by nonsurgical method seven days after first insemination and were classified by stereo-microscope. Of T1 and T2 were collected 9.36 ± 6.39 and 9.83 ± 9.04 structures per animal, respectively, of which 1.50 ± 1.69 and 2.67 ± 1.75 respectively were degenerate structures. The heifers smaller than 30 months produced 14.50 ± 4.73 total structures and 12.25 ± 3.95 viable structures for animal compared with the 4.25 ± 1.71 total structures and 3.25 ± 1.29 viable per animal in heifers bigger than 30 months. Regarding the quality of structures, heifers biggest than 30 months produced 3.25 ± 0.96, 0.75 ± 1.50 and 0.25 ± 0.50 structures grade I, II and IV respectively, while heifers smaller than 30 months produced 11.00 ± 2.83, 1.25 ± 1.50 and 2.25 ± 1.71 structures grade I, II and IV respectively. Difference doesn´t exist in the quantity neither in the quality of embryos collected from heifers and cows dairy Gyr cattle, however, among the biggest and smaller heifers to 30 months, the last ones have best response in quantity and embryonic quality.