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Articles by B.O. Omontese
Total Records ( 6 ) for B.O. Omontese
  T.A. Dare , P.I. Rekwot , Y.O. Aliu , M. Mamman , J.A. Obidi , N.P. Chiezey and B.O. Omontese
  The effect of season and Progesterone-Releasing Intravaginal Device (PRID) alone or with Pregnant Mare Serum Gonadotropin (PMSG) on ovarian function of 106 Bunaji cows was investigated in two seasons. In the dry season trial, 46 cows were randomly distributed into the following treatment groups: PRID alone (n = 16), PRID+PMSG (n = 15) and control (15). In the rainy season trial, 60 cows were randomly distributed into the following treatment groups: PRID alone (n = 20); PRID+PMSG (n = 20) and control (20). During the dry season, Bunaji cows treated with PRID alone had a significantly (p<0.05) lower estrus response than the cows administered with PRID+PMSG (37.5 vs 66.7%, respectively). During the rainy season, 65.0% of Bunaji cows treated with PRID+PMSG were found to be in estrus; this was not significantly higher than the value of 60.0% estrus rate recorded in Bunaji cows treated with PRID only. In PRID treated Bunaji cows, pregnancy rates of 25.0 and 45.0% was recorded during the dry and rainy season, respectively. Pregnancy rates in PRID+PMSG treated cows were 46.7 and 50.0%, respectively. Pregnancy rate was generally lower in the dry season than in the rainy season in both PRID only, PRID+PMSG and control groups. However, the highest pregnancy rate of 50.0% was obtained in PRID+PMSG treated Bunaji cows during the rainy season. Conception rate in Bunaji cows treated with PRID only (66.7%) was lower than cows treated with PRID+PMSG (70%) during the dry season although not significantly. Similarly during the rainy season, Bunaji cows treated with PRID+PMSG had a higher conception rate than cows treated with PRID only (76.9 vs 75.0%, respectively). This study suggests that the rainy season enhances greater ovarian function in dairy cows in the Northern Guinea Savannah zone of Nigeria and that administration of PMSG may potentiate fertility rates.
  B.O. Omontese , P.I. Rekwot , H.J. Makun , J.A. Obidi , J.S. Ruwaan and N.P. Chiezey
  The efficiency of EAZI-Breed™ CIDR® and FGA-30® intravaginal sponges in synchronizing estrus was investigated in prepartum Yankasa Ewes. About 20 randomly cycling pre-partum Yankasa ewes aged between 1.5-2 years and weighing between 13-15 kg was used for this study. They were randomly assigned into two groups, Group A (FGA, n = 10) and Group B (CIDR®, n = 10) for 14 days. Natural mating by a fertile ram was performed following progestagen withdrawal for ewes detected to be on heat. Estrus response in Group A and B was 70 and 80%, respectively. The time to estrus onset following progestagen withdrawal for FGA-30 and CIDR (Mean±SEM) was 43.60±6.98 and 23.57±4.07 h, respectively. In Groups A and B, the duration of induced estrus was (46.65±3.08 and 53.90±5.87 h) while estrus cessation was (90.37±8.44 and 77.92±4.24 h) post withdrawal of the devices. The interval from withdrawal of progestagen to onset of estrus was (p<0.05) longer in FGA than in CIDR (43.60±6.98 vs. 23.57±4.07 h). However, the duration of induced estrus period was shorter in the FGA group than the CIDR group. Retention rate was lower in group A (60%) than B (90%). Drawstring breakage observed in FGA sponges was absent in CIDR devices (20% versus 0) while vaginal discharge rate was higher in group A. These results show that although FGA and CIDR devices are equally efficient in synchronizing estrus in prepartum Yankasa ewes, CIDR provides higher estrus response rate, shorter time to estrus, longer duration of estrus, higher retention rate and ease of application. Consequently, the use of CIDR is recommended.
  T.A. Dare , P.I. Rekwot , Y.O. Aliu , M. Mamman , J.A. Obidi , B.O. Omontese , N.P. Chiezey and J.S. Rwuann
  The effect of season and Progesterone-Releasing Intravaginal Device (PRID) alone or with Pregnant Mare Serum Gonadotropin (PMSG) on ovarian function of 106 Bunaji cows was investigated in two seasons. In the dry season trial, 46 cows were randomly distributed into the following treatment groups: PRID alone (n = 16), PRID+PMSG (n = 15) and control (15). In the rainy season trial, 60 cows were randomly distributed into the following treatment groups: PRID alone (n = 20); PRID+PMSG (n = 20) and control (20). During the dry season, Bunaji cows treated with PRID alone had a significantly (p<0.05) lower estrus response than the cows administered with PRID+PMSG (37.5 vs 66.7%, respectively). During the rainy season, 65.0% of Bunaji cows treated with PRID+PMSG were found to be in estrus; this was not significantly higher than the value of 60.0% estrus rate recorded in Bunaji cows treated with PRID only. In PRID treated Bunaji cows, pregnancy rates of 25.0 and 45.0% was recorded during the dry and rainy season, respectively. Pregnancy rates in PRID+PMSG treated cows were 46.7 and 50.0%, respectively. Pregnancy rate was generally lower in the dry season than in the rainy season in both PRID only, PRID+PMSG and control groups. However, the highest pregnancy rate of 50.0% was obtained in PRID+PMSG treated Bunaji cows during the rainy season. Conception rate in Bunaji cows treated with PRID only (66.7%) was lower than cows treated with PRID+PMSG (70%) during the dry season, although not significantly. Similarly during the rainy season, Bunaji cows treated with PRID+PMSG had a higher conception rate than cows treated with PRID only (76.9 vs 75.0%, respectively). In conclusion, this study suggests that the rainy season enhances greater ovarian function in dairy cows in the Northern Guinea Savannah zone of Nigeria and that administration of PMSG may potentiate fertility rates.
  J.S. Rwuaan , P.I. Rekwot , P.A. Abdu , L.O. Eduvie , B.O. Omontese and J.A. Obidi
  Fifty 20 weeks old Shikabrown (SB) cocks consisting of 22 red and 28 white SB cocks were purchased from the National Animal Production Research Institute Shika. The cocks were fed on a diet of layers mash with 18% crude protein, 95.6% dry matter, 17.1% crude fibre and 3% nitrogen. About 25 cocks consisting of 8 red and 17 white SB cocks selected on the basis of body weight and antibody titres were infected with 0.2 mL of 106.0 EID50 of velogenic Kudu 113 strain of Newcastle disease virus intranasaly and orally. About 25 cocks consisting of 14 red and 11 white SB cocks served as control. Cloacal temperatures, body weights and semen samples of both control and infected cocks were taken weekly for 6 weeks. The semen was evaluated for volume, colour, motility, concentration, percentage live spermatozoa and percentage total spermatozoa abnormalities. Semen colour was graded as creamy (1 = very good); milky (2 = good) and watery (3 = poor). There was no significant difference in the cloacal temperatures and body weights of control and infected red and white SB cocks. The infected red and white cocks had slightly higher cloacal temperatures than the control. The semen volume of infected red cocks showed a general increase over that of the control red cocks. The semen volume of the control white SB cocks was significantly higher than that of the infected white cocks. The white SB cocks had higher semen volume than the red SB cocks. The red SB cocks had slightly better semen colour than the white SB cocks. The control white cocks had higher spermatozoa motility than the infected white cocks while the infected red cocks had higher spermatozoa motility than the control red cocks. The white SB cocks generally had better spermatozoa motility than the red cocks. The spermatozoa concentration of the control white cocks was consistently higher than that of the infected white SB cocks; the reverse was the case with the red cocks where the spermatozoa concentration of the infected red cocks was higher than that of the control red cocks. The white cocks had better spermatozoa concentration than the red cocks. The control white SB cocks had significantly (p<0.05) higher percent live spermatozoa than the infected white cocks. Similarly, the infected red SB cocks had lower percent live spermatozoa than the control red cocks. The control white SB cocks had significantly (p<0.05) higher percent live spermatozoa than the control red SB cocks. The infected red and white SB cocks had higher percentage total spermatozoa abnormalities than the contol red and white cocks. It can be concluded from this study that the white SB cocks had better semen quality than the red SB cocks; the non-infected SB cocks had better semen quality than the infected SB cocks. It is recommended that white SB cocks be used for breeding purposes and that breeder cocks should be routinely vaccinated against Newcastle disease to ensure that the level of antibodies is high enough to prevent adverse effect on semen quality.
  J.S. Ruwaan , P.I. Rekwot , P.A. Abdu , B.O. Omontese , J.A. Obidi and N.P. Chiezey
  About fifty 20 weeks old Shika Brown (SB) cocks were used in this study. Five cocks consisting of three Red Shika-Brown (RSB) and two White Shika-Brown (WSB) were bled for serum samples for testosterone assay at weeks 1, 3 and 6 pre and post-infection with a Velogenic Newcastle disease virus. Blood samples were collected at 30 min interval for 3 h from each cock on the days of sampling. The blood samples were centrifuged in a Hermle Z364 centrifuge at 251.6x g for 15 min with the sera obtained stored in serum vials and kept in a deep freezer at -20°C until analysis using the Enzyme Linked Immunosorbent Assay (ELISA) technique. At the end of the study, twenty control (n = 20) and twenty infected (n = 20) cocks were slaughtered. Their testicles were removed, measured, minced and ground for the determination of gonadal sperm reserves. The mean testosterone concentration of both the control SB cocks and the pre-infected SB cocks had no particular pattern. The mean testosterone concentration post infection showed a decrease from week 1-6. The mean testosterone concentration peak for the control red SB cocks was 1, 2 and 2.5 nmols mL-1 at weeks 1, 3 and 6, respectively while the white SB cocks had 12.5, 5.5, 3 nmols mL-1 at weeks 1, 3 and 6, respectively. The infected red SB cocks had mean testosterone concentration peaks of 9.7, 6.3 and 2.7 nmols mL-1 at weeks 1, 3 and 6 post-infection, respectively while the white SB cocks had a mean testosterone concentration peak of 6.5, 14.5 and 6.5 nmols mL-1 at weeks 1, 3 and 6 post-infection, respectively. The gonadal sperm reserves of the control red and white SB cocks were not significantly different but the gonadal sperm reserves of the control white SB cocks was significantly (p>0.05) higher than the gonadal sperm reserves of the infected red and white SB cocks. The total gonadal sperm reserve of the control white cocks was significantly (p>0.05) higher than the total gonadal sperm reserves of the infected red and white SB cocks.
  B.O. Omontese , P.I. Rekwot , H.J. Makun , J.A. Obidi , J.S. Rwuaan and N.P. Chiezey
  The efficiency of EAZI-Breed™ CIDR® and FGA-30® intravaginal sponges in synchronizing estrus was investigated in prepartum Red Sokoto does. About 19 randomly cycling pre-partum Red Sokoto does aged between 1.5-2 years and weighing between 12-14 kg were used for this study. They were randomly assigned into two groups, Group A (FGA, n = 10) and Group B (CIDR®, n = 9) for 21 days. Natural mating was performed following progestagen withdrawal for animals detected to be on heat. Estrus response was 20 and 55.6% in groups A and B, respectively. The time to estrus onset following progestagen withdrawal for FGA and CIDR (Mean±S.D.) was 93.09±2.06 and 50.29±4.71 h; duration of induced estrus (0.08±0.05 and 39.99±6.05 h) while estrus cessation was (93.14±2.03 and 90.48±4.69 h) in group A and B, respectively. Interval between withdrawal of progestagen and onset of estrus was significantly (p<0.05) longer in FGA compared to CIDR. The duration of induced estrus period was significantly (p<0.05) longer in CIDR treatment. Retention rate was 100% (FGA) and 88.9% (CIDR) in group A and B, respectively. Drawstring breakage was observed in FGA sponges but absent in CIDR devices. Also, vaginal discharge rate was higher in FGA than CIDR groups. These results show that CIDR devices are more efficient in synchronizing estrus in prepartum Red Sokoto does. This is because CIDR provides higher estrus response rate, shorter time to estrus, longer duration of estrus, absence of drawstring breakage and better ease of application. Therefore, the use of CIDR is advocated.
 
 
 
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