Sokoto Journal of Veterinary Sciences最新文献

{"title":"Evaluation of the sleep modulating effects of methanolic extracts of Strychnos spinosa and Strychnos innocua fruits in mice","authors":"M. Sani, F. Khan, D. Sani, MM Sulaiman, E. Nwasor, A. Hassan","doi":"10.4314/sokjvs.v20i5.10","DOIUrl":"https://doi.org/10.4314/sokjvs.v20i5.10","url":null,"abstract":"This study aimed to evaluate the sleep modulating properties of Strychnos spinosa and Strychnos innocua fruits in Swiss albino mice. The depressant effect of the extracts on the central nervous system was studied using a diazepam-induced sleep model in mice. The mice were divided into four groups of six mice each. The test groups received Strychnos spinosa and Strychnos innocua fruits extracts at the doses of 250, 500, and 1000 mg/kg body weight intraperitoneally. In contrast, the control group received distilled water at 10 ml/kg. Diazepam (Ranbaxy®, India) was used as a standard drug and administered 30 minutes after the initial treatment. The lethal doses (LD50) of the two extracts were estimated to be >5000 mg/kg. The results obtained from the onset of sleep of rats administered methanol extracts of Strychnos spinosa, and Strychnos innocua fruits showed that the extracts at 250, 500, and 1000 mg/kg, respectively, did not significantly (p >0.05) alter the onset of sleep when compared with the control. The onset of sleep in the groups treated with Strychnos spinosa fruit extracts indicated a dose-dependent decrease pattern. The study also revealed a prolonged duration of sleep in all the experimental groups treated with the two extracts compared to the control group. The treated groups of 250, 500 and 1000 mg/kg significantly (p <0.05) prolonged the duration of diazepam-induced sleep in a dose-dependent manner when compared to the control group. The group treated with 1000 mg/kg of Strychnos innocua fruit extract was significant (p <0.05) compared to the control group. In conclusion, the high LD50 observed in this study suggests that the two extracts are relatively safe and contain promising bioactive ingredients that cause sleep modulation in mice.","PeriodicalId":253894,"journal":{"name":"Sokoto Journal of Veterinary Sciences","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120964243","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of Cellgevity® on the milt quality of catfish,Clarias gariepinus extended in sodium citrate during chilled storage","authors":"JS Bugau, S. Lanko, D. Ogwu, P. Rekwot, M. Shinkut, J.I Itodo","doi":"10.4314/sokjvs.v20i5.12","DOIUrl":"https://doi.org/10.4314/sokjvs.v20i5.12","url":null,"abstract":"Cellgevity® is a supplement reported to comprise mostly D-Ribose and L-Cysteine enriched glutathione, known to be an effective antioxidant that improves spermatozoa quality. However, its effect on milt characteristics has not been reported. This study, therefore, aimed to evaluate the effects of Cellgevity® on the milt quality of catfish (Clarias gariepinus) extended in sodium citrate during chilled storage. Pooled milt sample from three fishes was divided into three groups (T1, T2 and T3). The milt was extended in sodium citrate, and each group in triplicate was supplemented with Cellgevity® at 0 mg (T1), 125 mg (T2) and 250 mg (T3). The spermatozoa motility, concentration, viability and morphology were evaluated on days 0, 1, 2, 3, 4 and 5 of chilled storage. Data were expressed as mean ± standard deviation (SD) and analysed with a one-way analysis of variance (ANOVA) followed by Dunnett's multiple comparison test. Mean ± SD spermatozoa motility was significantly (P < 0.001) lower in T2 and T3 than T1 before and during the first 3-days storage period. Mean ± (SD) spermatozoa concentration was significantly (P < 0.001) higher in T2 and T3 than T1 before and throughout the 5-days storage period. Mean ± SD live spermatozoa were significantly (P < 0.001) lower in T3 than T1 at day 2 of the storage. Mean ± SD total abnormal spermatozoa did not differ significantly (P > 0.05) among the groups before and throughout the 5-days storage period. It was concluded that although supplementation of Cellgevity® at 125 mg and 250 mg in milt of catfish, extended in sodium citrate in chilled storage maintained the sperm cells alive and motile up to four days of the storage. However, it did not improve the milt quality. Hence, it should not be supplemented in sodium citrate extended milt of catfish, Clarias gariepinus in chilled storage.","PeriodicalId":253894,"journal":{"name":"Sokoto Journal of Veterinary Sciences","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114277645","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Anti-oxidative influence of butylated hydroxytoluene on chilled semen of Red Sokoto bucks and consequential conception rates in does","authors":"T. Bello, P. Rekwot, J. Ayo, AM Khumran, BB Oyelowo","doi":"10.4314/sokjvs.v20i5.9","DOIUrl":"https://doi.org/10.4314/sokjvs.v20i5.9","url":null,"abstract":"The anti-oxidative influence of Butylated Hydroxytoluene (BHT) in three extenders on chilled semen of red Sokoto bucks and conception rates in does was evaluated. Twenty matured red Sokoto bucks were selected for this study. Two ejaculates were collected from each buck per week for a period of 4 weeks. Semen was collected from bucks using a battery-operated electro-ejaculator for semen analyses. Volume, colour, gross motility, concentration and percentage live spermatozoa were examined. A total of 10 ejaculates were further collected weekly from 10 selected bucks from the previous twenty good semen quality for 8 weeks. Semen was extended in tris egg-yolk (TEY), citrate egg-yolk (CEY) and tris-coconut water (TCW) extenders in test tubes, containing BHT antioxidant to obtain 0 (control), 0.5, 1.0, 1.5 and 2.0 mM/mL BHT. Sperm characteristics were determined at 0, 24, 48 and 72 hours of storage. Twenty multiparous does divided into 3 groups (A, B and C), of 7, 7 and 6 does respectively. These does received 250 μg cloprostenol intramuscularly, twice, 11 days apart and insemination was conducted 48 hours after. Groups A, B and C were inseminated with semen stored for 72 hours containing 1.0 mM/mL of BHT extended in TEY, 1.0 mM/mL of BHT extended in CEY and 0.5 mM/mL of BHT extended in TCW respectively. Ultrasonography was used for pregnancy diagnoses 47 days after artificial insemination. From the findings of this study, it was concluded that semen of red Sokoto bucks stored in tris egg yolk + 1.0 mM/mL BHT and chilled for 72 hours had better semen quality and conception rates.","PeriodicalId":253894,"journal":{"name":"Sokoto Journal of Veterinary Sciences","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134231308","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fractional extracts of Azadirachta indica leaf affect spermiogram, testosterone profile, and testis histology of rabbit bucks","authors":"M. Umar, E. Bawa, D. Ogwu, B. Hassan, B. Habib, TA Ige","doi":"10.4314/sokjvs.v20i5.5","DOIUrl":"https://doi.org/10.4314/sokjvs.v20i5.5","url":null,"abstract":"The effect of fractions from a crude extract of Azadirachta indica leaves on spermatogenesis, testicular histology and testosterone concentration of New Zealand White rabbits were evaluated in this study. Twenty-five matured male New Zealand White rabbits were used for this study and were randomly assigned to five groups (A, B, C, D, and E). Group A served as the control and was administered distilled water (0.5ml); while groups B, C, D and E served as the hexane, chloroform, ethyl acetate, and butanol treated groups, respectively at the same dosage of 300 mg/kg. Semen samples were collected using an artificial vagina weekly for twelve weeks and were evaluated for volume, colour, motility, concentration, percentage live-dead ratio and morphological abnormalities. A blood sample (2ml) was also collected from each buck through venipuncture of the ear vein three times at regular intervals for the determination of testosterone concentration. Two bucks from each group were humanely sacrificed at the end of the experiment for testicular histology. Significantly lower (p<0.05) sperm motility, higher dead sperm cells, sperm abnormalities, degenerative changes, depletion and vacuolation of spermatogenic cell layers were observed in treatment group C at the end of the experiment. The present study has shown that the chloroform fraction of methanolic crude Azadirachta indica (neem) leaves extract is detrimental to sperm cells and testicular histology.","PeriodicalId":253894,"journal":{"name":"Sokoto Journal of Veterinary Sciences","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128645450","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of sodium selenite on sub-acute paraquat-induced toxicity in male rats","authors":"S. Idris, HA Kakkaba, S. Enam, L. Adekunle, I. Abdullahi, S. Adamu","doi":"10.4314/sokjvs.v20i5.11","DOIUrl":"https://doi.org/10.4314/sokjvs.v20i5.11","url":null,"abstract":"Acute paraquat (PQ) toxicity induces redox cycling leading to fatality in both man and animals with clinical management being supportive therapy due to lack of specific and effective antidote. This study thus aimed at determining the sero-biochemical and pathological changes induced by acute PQ administration in male rats and the mitigating role of sodium selenite. Forty male rats were used for the study and were grouped into 5 of eight rats viz: Group I (control) administered distilled water (2 ml/kg), group II (15 mg/kg of PQ), group III (15 mg/kg of PQ + 0.3 mg/kg sodium selenite), group IV (30 mg/kg of PQ) and group V (30 mg/kg of PQ + 0.3 mg/kg sodium selenite). Administration were achieved per os and lasted for a week. Sera, lungs, liver and kidney samples were harvested at the end of the experiment. Result showed a significant (p < 0.05) higher liver enzymes, urea and creatinine in treated groups when compared to control. Biomarkers of oxidative stress revealed a significant (p < 0.05) increased superoxide dismutase and malondealdehyde activities of the lungs and liver. A dose-dependent pathologic lesion was also observed with milder lesions in selenium supplemented groups. The results demonstrate that selenium supplementation may be a promising therapy and should further be clinically validated.","PeriodicalId":253894,"journal":{"name":"Sokoto Journal of Veterinary Sciences","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115500219","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"In vitro anticoccidial activity of ethanolic leaf extract of Citrus aurantium L. against Eimeria tenella oocysts","authors":"A. Ishaq, D. Sani, SA Abdullhi, I. Jatau","doi":"10.4314/sokjvs.v20i5.4","DOIUrl":"https://doi.org/10.4314/sokjvs.v20i5.4","url":null,"abstract":"This study was carried out to examine the anticoccidial effect of Citrus aurantium L ethanol leaf extract against the oocysts of Eimeria tenella isolated from broiler chickens. The fresh leaves of C. aurantium were collected from Emirate Garden, Katsina, authenticated, air-dried at room temperature, pulverised by milling and subjected to extraction. Sporulation inhibition bioassay was employed to examine the activity of C. aurantium ethanol extract on the sporulation of E. tenella oocysts. In this assay, deep well petri dishes containing 100 unsporulated oocysts were subjected to 2 ml of five different concentrations of the extract (2.5, 5, 10, 20 and 30 mg/ml) in triplicates while oocysts sporulated in 2.5% potassium dichromate solution (K2Cr2O7) and phenol served as control groups. The content of the Petri dishes was stirred to ensure adequate oxygenation. The experimental set-up was incubated at room temperature and examined after 24 and 48 hours for sporulation inhibition. The sporulated and unsporulated oocysts were determined by counting using the Mcmaster apparatus. Phytochemical screening of C. aurantium revealed the presence of alkaloids, saponins, carbohydrates, steroids and tannins. The result showed that ethanolic leaf extract of C. aurantium to possess anticoccidial activity against unsporulated oocysts of E. tenella in a concentration-dependent manner. There was significant difference (p < 0.05) in the sporulation inhibition activity, with the highest (97 ± 0.8%) at 30 mg/ml and the lowest activity (8 ± 1.0%) at 2.5 mg/ml concentration of the extract after 48 hours of incubation. There was a general trend of sporulation inhibition with an increase in the concentration of the plant extract. The findings from this study showed ethanol leaf extract of C. aurantium possesses a remarkable In vitro anticoccidial effect that may be further scientifically explicated.","PeriodicalId":253894,"journal":{"name":"Sokoto Journal of Veterinary Sciences","volume":"15 22","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120866732","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Prenatal skull radiography and calvaria histogenesis in Uda and Yankasa breeds of sheep","authors":"SM Atabo, A. Umar, S. Shehu, A. Abubakar, A. Danmaigoro, TA Muazu","doi":"10.4314/sokjvs.v20i5.3","DOIUrl":"https://doi.org/10.4314/sokjvs.v20i5.3","url":null,"abstract":"The anterior fontanelle was opened and radiolucent in the second trimester; at the third trimester, the fontanelle began to shrink and finally closed at birth and became radiopaque. The borders of the orbit and the teeth were both radiolucent and undifferentiated at the second trimester and at the third trimester, and these regions became radiopaque at the second and third trimester, respectively. The histomorphology of the calvarium in the first-trimester foetus had three layers consisting of the mesenchymal and osteoblast cells; as the foetus ages within the second trimester, the mesenchymal cells were transformed into osteoblast, colonies, primitive bone spicules, matured bone spicules, and primitive trabeculae respective, in the third trimester, the primitive trabeculae developed into a matured trabeculae, in the day old, the matured trabeculae transforms into a primitive spongy bone. However, this process occurs earlier in Yankasa than in Uda. The histomorphology of the calvarium during foetal life is similar in the Uda and Yankasa. However, the stages of calvarium development occur earlier and faster in Yankasa than Uda of the same ages. This implies that foetal development and time of parturition could occur earlier in the Yankasa compared to the Uda breeds.","PeriodicalId":253894,"journal":{"name":"Sokoto Journal of Veterinary Sciences","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115758814","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of Allium sativum and Allium cepa on semen characteristics, sperm reserves and haematology of rabbit bucks","authors":"SD Olojo, P. Rekwot, RY Olobatoke, SF Uchenna, KO Jolayemi","doi":"10.4314/sokjvs.v20i5.2","DOIUrl":"https://doi.org/10.4314/sokjvs.v20i5.2","url":null,"abstract":"The effect of dietary inclusion of garlic and onion on semen characteristics, gonadal, extragonadal sperm reserves and haematology of rabbit bucks were evaluated. Twenty-four rabbit bucks of average age and weight 10 ± 2.0 months and 1.47 ± 0.01 kg respectively, were used for the study. They were randomly assigned into four groups of six bucks each. Group A served as control, while Groups B, C and D received dietary inclusion of 5% garlic, 5% onion, 2.5% garlic + 2.5% onion, respectively. The fresh bulbs of garlic and onions were peeled, air-dried, and the dried bulbs were weighed, added to the feed and grounded together to form experimental diets. Before dietary supplementation, semen samples were collected to serve as baseline values, followed by weekly collections for another 9 weeks using an artificial vagina. Haematological parameters were examined according to the standard procedure, while testosterone profile was conducted using the ELISA method. At the termination of the experiment, two bucks from each group were euthanised, and the testes were harvested to evaluate gonadal and extragonadal sperm reserves. No significant (p > 0.05) difference was recorded in the live weight, sperm concentration, and sperm abnormality of the rabbit bucks. A significant (p < 0.05) difference was observed in the ejaculate volume, gross motility, pH, reaction time, and percentage of live spermatozoa. The epididymal sperm reserves in group B, was significantly (p < 0.05) higher in the right than left. Testosterone profile showed significant (p < 0.05) difference at 9 and 10 a.m. On haematology, there was a significant increase in PCV, RBC count, haemoglobin concentration and WBC count in groups B, C and D by week 9 compared to the control. In conclusion, the dietary inclusion of garlic and onion effectively improved the spermiogram of rabbit bucks.","PeriodicalId":253894,"journal":{"name":"Sokoto Journal of Veterinary Sciences","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128109069","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Anti-diarrhoeal effects of Garcinia kola (Heckel-Holl) seed methanolic extract and its fractions in animal models","authors":"M. Okoronkwo, M. Suleiman, N. Chiezey, CC Udechukwu, J. Oyetunde, KO Jolayemi","doi":"10.4314/sokjvs.v20i5.1","DOIUrl":"https://doi.org/10.4314/sokjvs.v20i5.1","url":null,"abstract":"This study investigated the In vitro spasmolytic and In vivo anti-diarrhoeal effects of Garcinia kola seed extract/fractions. Extraction was done by maceration in 70% methanol, serially partitioned in ethyl acetate and n-hexane. Qualitative phytochemical screening was carried out on the crude extract/fractions. The In vitro spasmolytic effect of the extract and fractions at different concentrations (0.5×103, 0.2×103,0.1×103, 0.6×102 mg/ml) were investigated against spontaneous and acetylcholine-induced contractions in isolated rabbit jejunum as well as histamine-induced contractions using isolated guinea pig ileum. The In vivo anti-diarrhoeal effect of the extract was evaluated using three diarrhoeal models: castor oil-induced diarrhoea, charcoal meal gastrointestinal transit time and castor oil-induced enteropooling. In each model, 25 mice were randomly divided into five groups of 5 mice each. Group I served as the untreated control, while group II was a positive control. Groups III-V were administered 125, 250 and 500 mg/kg of the crude methanol extract, respectively. The crude extract, ethyl acetate and aqueous fractions at 0.5×103 mg/ml respectively exhibited 14.4%, 12.9% and 12.2% spasmolytic activities against acetylcholine-induced rabbit jejunum contractions. Histamine-induced guinea pig ileum contractions were inhibited by crude extract (6.2%), ethyl acetate (6.2%), aqueous fraction (7.2%) at 0.6×102 mg/ml. For castor oil-induced diarrhoea, the crude extract at 500 mg/kg produced a significant (p < 0.05) decrease in the diarrhoeal index and faecal weight with a percentage inhibition of 70.4% compared with controls. Similarly, the crude extract (500 mg/kg) significantly (p < 0.05) decreased the charcoal meal gastrointestinal transit time with a percentage inhibition of 33.9% and elicited significant (p < 0.05) intraluminal fluid reduction (9.1%) in castor oil-induced enter pooling test when compared with the untreated group. In conclusion, the anti-motility and anti-secretory activities of the crude extract were attributed to the phytochemical constituents present.","PeriodicalId":253894,"journal":{"name":"Sokoto Journal of Veterinary Sciences","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128823448","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of heat stress on follicular size, oestradiol concentration and oestrus expression in Nigerian Zebu cows","authors":"W. Ndumari, P. Dawuda, I. Ate, P. Rekwot","doi":"10.4314/sokjvs.v20i2.2","DOIUrl":"https://doi.org/10.4314/sokjvs.v20i2.2","url":null,"abstract":"The study was conducted to evaluate the effect of heat stress on follicular size, oestradiol concentrations and oestrus expression in different seasons on Zebu cows. Twelve (n=12) matured, Zebu cows were utilized for over a year. The year was divided into 3 phases. Ambient temperature, relative humidity and rectal temperature were determined using. Cows were synchronized for oestrus. Ultrasonic follicular studies were carried out daily. Blood samples were collected after administration of a second dose of PFG2α to assess serum concentration of oestradiol. The enzyme-linked immunosorbent assay technique was used to determine the concentration of oestradiol. Oestrus activities were monitored by visual observation. Follicle diameters at 24 hr were lower (P< 0.05) in the cold, dry season (6.34± 0.68 mm) than hot dry (8.09±0.52 mm) and the rainy season (8.62±0.9 mm). At 72 hr, follicular diameters were significantly higher P<0.05 in the hot, dry season (17.01±1.41 mm) than cold dry (12.90±1.22 mm) and the rainy season (12.08±0.82 mm). Time to peak of oestradiol concentrations was shorter P<0.05 in the cold, dry season (31.50±5.41 hr), followed by a hot, dry season (35.42±4.25 hr) and then rainy season (52.25±7.08 hr). The amplitude of oestradiol was higher P<0.05 in the cold, dry season (39.13±5.27 pg/mL) than hot dry (19.50±2.52 pg/mL) and rainy seasons (17.63±1.89 pg/mL). Durations of proestrus oestradiol surges were significantly higher P<0.05 in the rainy season (40.88±7.10 hr) followed by a hot, dry season (35.50±7.71 hr) and then cold dry season (24.25±3.27 hr.). The total number of mounting activities for two hr. was higher P<0.05 in the cold, dry season (7.6±0.93/hr) followed by rainy season (6.2±1.28/hr) and then hot dry season (4.4±0.81/hr). In conclusion, the study showed that heat stress affected oestrus expression by lowering the number of mounts per hour, increasing follicular size and reducing oestradiol concentration of these cows.","PeriodicalId":253894,"journal":{"name":"Sokoto Journal of Veterinary Sciences","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125133117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}