Mansoura University, Faculty of AgricultureJournal of Animal and Poultry Production2090-364212220210201Effect of Dietary Partial Replacement of Corn Grains by Mango Seeds on Productive and Reproductive Characterization of Damascus Goat Bucks at Prepubertal Stage616915328910.21608/jappmu.2021.153289ENAhmed MohamedShehabeldinBiotechnology Research Department - Animal Production Research InstituteGhada S.El-EsawyAnimal Production Research Institute – Agricultural Research Center – EgyptHeba A.El-SanafawyAnimal Production Research Institute – Agricultural Research Center – EgyptJournal Article20210303This study aimed to evaluate the effect of, replacing corn grains in concentrate feed mixture (CFM) with mango seeds (MS) in Damascus goat buck’s diets, on productive and reproductive characteristics at prepubertal stage (weaning-prepuberty). Corn grains in CFM were replaced with mango seeds at levels of 0% MS (G1, control), 15% (G2) and 30% (G3). Results revealed that G3 showed the highest (P<0.05) LBW and average daily gain (ADG). Feed conversion ratio, all nutrients digestibility, feeding values, and economic feed efficiency were improved (P<0.05) in G2 and G3 compared with G1. Animals in G2 and G3 showed earlier (P<0.05) ages to produce the 1<sup>st</sup> ejaculation than control. Testosterone concentration one-month prepuberty increased (P<0.05) in G2 compared with G1 and G3. Testicular measurements and scrotal circumference in G2 as well as only testicular length in G3 increased (P<0.05) in comparing with G1. Mediastinum width increased in G2, decreased in G3 compared with G1 (P<0.05). Tunica albuginea was thicker (P<0.05) in G2 and G3 than in G1. Scrotal septum was wider (P<0.05) in G3 than in G2. Prostate and vascular gland were longer (P<0.05) and wider in G2 and G3 than in G1. This study concluded that replacement of corn grains with mango seeds at level of 30% in diets of Damascus goat bucks has a positive effect on productive performance. The replacement at a level of 15% MS improved reproductive characterization of bucks raised for semen production for breeding programs.<span style="text-decoration: underline;"> </span>https://jappmu.journals.ekb.eg/article_153289_9a67115f6bb7dd4d24d91da0a628f246.pdfMansoura University, Faculty of AgricultureJournal of Animal and Poultry Production2090-364212220210201Selenium and Zinc as Supplements to Extenders Frozen Semen for Improving Sperm Characteristics during Cryopreservation717715329010.21608/jappmu.2021.153290ENW. F.FouadAnimal Production Research Institute, Agricultural Research Center, Ministry of Agriculture, Egypt.A. F.AshourAnimal Production Research Institute, Agricultural Research Center, Ministry of Agriculture, Egypt.Journal Article20210303Aim of this study is to evaluate the effect of adding different levels of Zinc and Selenium on extender as antioxidants to improve Friesian-bull semen quality after cryopreservation. Semen was collected, pooled, and extended with five treatment extenders, including control without (E1), 0.3 mg/100ml Zn (E2), 0.6 mg/100ml Zn (E3), 0.2 mg/100ml Se (E4), and 0.5 mg/100ml Se (E5). Semen was evaluated for visual parameters after dilution, equilibration, and thawing. Also, semen was evaluated by CASA only after thawing. Results showed that there are no effects of all additives on sperm characteristics after dilution and thawing. Only visual progressive motility percentage increased (P<0.05) post-equilibration by E5. Percentages of acrosome integrity were enhanced by E4 and E5. Semen analysis by CASA revealed that non-motility, and total and head abnormalities percentages were decreased (P<0.05), while vitality, and total and rapid progressive motility percentages were increased (P<0.05) by E5. Dynamic sperm parameters straightness and wobble) were increased (P<0.05) E5. In conclusion, adding selenium at a level of 0.5 mg/100ml to extender of cryopreserved Friesian-bull semen ha beneficial effects on maintaining sperm parameters and improved sperm freezability. This may be used as a tool for improving cryopreserved semen in artificial insemination centers.https://jappmu.journals.ekb.eg/article_153290_b6ba36ac9499b3d146c9908cf7528add.pdfMansoura University, Faculty of AgricultureJournal of Animal and Poultry Production2090-364212220210201The Effect of Cryopreservation Temperature and Time on Viability and In Vitro Maturation of Sheep Oocytes798315329110.21608/jappmu.2021.62680.1010ENEhab SalahAbdel-AalAnimal production, faculty of Agriculture , Cairo universityJournal Article20210303This study aim to compare the effects of freezing techniques on viability and in vitro maturation of sheep oocytes. This experiment was carried out in Animal Production Research Institute. Sheep ovaries were obtained from slaughterhouse. A total of 695 oocytes were used in this study, 114 oocytes as control and 581 were exposed to LN2 vapor then divided into 3 groups: G1(190); directly plunged into LN2, G2 (198): cryopreserved in ˗80 <sup>o</sup>C freezer and, G3 (193), plunged into LN<sub>2</sub> for 10 min and then transferred to –80 <sup>o</sup>C freezer. Oocytes in each group were cryopreserved for (24h, and 7days). There were high significantly differences (P<0.01) between the percentage of damage for cryopreserved oocytes, where zona dissolution was the main damage for (G1and G3) oocytes. Whereas, zona rupture was the highest damage occurred in (G2) oocytes. Survival rate of G1 oocyte was higher significantly (P<0.05) than G3 and G2, the same results were obtained pattern, either after 24h or 7 days storage. Highly significant differences (P<0.01) between maturation rate achieved with the control oocytes (63%) compared with the other groups. After 24 h of storage, G1 recorded higher MII rate followed by G3 and G2 (47, 37 and 28%, respectively), MII % decreased at 7 days storage in G1, G3 and G2 (44%, 34% and 31%, respectively). In conclusion, Cryopreservation of sheep oocytes (G3) in –80 °C freezer achieved acceptable survival and in vitro maturation rates. The –80°C freezer provide a simple and cheap tool to maintain frozen sheep oocytes.https://jappmu.journals.ekb.eg/article_153291_7dcf7ddda70340f15fffcf3659608a8c.pdfMansoura University, Faculty of AgricultureJournal of Animal and Poultry Production2090-364212220210201Effect of Feeding Frequency and Housing System on Physiological Responses and Performance of Male Lambs under Upper Egypt Hot Conditions858915329310.21608/jappmu.2021.59510.1008ENG. F.AbozedAnimal Production Research Institute, Agriculture Research Center, Dokki, Giza, Egypt.M. A.BoraeiAl-Azhar University, Faculty of Agric., Anim. Prod. Department, Nasr City, Cairo, Egypt.M. A. I.El-SysyAl-Azhar University, Faculty of Agric., Anim. Prod. Department, Nasr City, Cairo, Egypt.Y. H.HafezAnimal Production Research Institute, Agriculture Research Center, Dokki, Giza, Egypt.O. A. M.El-kheshenAnimal Production Research Institute, Agriculture Research Center, Dokki, Giza, Egypt.Journal Article20210303A total of 40 Farafra ram-lambs were used to investigate the effect of feeding frequency under different housing systems on physiological responses and growth performance under Upper Egypt hot conditions. Lambs were randomly allocated to 4 groups (10 lambs each); group (I) fed twice daily and housed in a semi-open pen, group (II) fed twice daily and housed in double-roofed pens, group (III) fed three times daily and kept in a semi-open pen and group (IV) fed three times daily and kept in a double-roofed pen. During the experimental period, the mean THI at pm was significantly higher in semi-open type than double-roofed one (90.2 ± 0.27 <em>vs.</em> 83.9 ± 0.29). At 12.00:14.00 h. pm, the lowest respiration rate was recorded in a group (IV) "56.0 ± 2.44" and the highest one was recorded in a group (I) "70.5 ± 3.3" and rectal and skin temperatures almost have taken similar trend. The results revealed that blood metabolites did not significantly (<em>P</em> > 0.05) affected by either housing type or feeding frequency. The results showed that group (III) had the highest final body weight (37.2 ± 0.97 kg) and total body weight gain (21.7 ± 0.68 kg) and average daily gain (148.2 ± 6.50 g/day) followed by group (I) then group (IV) and group (II). In conclusion, the feeding frequency of 3 times daily was more beneficial than feeding twice, and the physiological responses of lambs housed under double-roofed closed type were better compared to semi-open type.https://jappmu.journals.ekb.eg/article_153293_1cc53f0671abfb9d78d5978a98e17655.pdfMansoura University, Faculty of AgricultureJournal of Animal and Poultry Production2090-364212220210201Effect of Feeding Frequency on Productive Broiler Performance919415329510.21608/jappmu.2021.153295ENNasrin H.AzizDepartment of Animal Science, College of Agricultural Engineering Sciences, Sulaimani University, Sulaimani, Iraq.Rozhgar BaizSaeedDepartment of Animal Science, College of Agricultural Engineering Sciences, University of Sulaimani, Al-Sulaimaniyah, Kurdistan Region, Iraq.Shilan AramAkramDepartment of Animal Science, College of Agricultural Engineering Sciences, University of Sulaimani, Al-Sulaimaniyah, Kurdistan Region, Iraq.Shahla M. SaeedKirkukiDepartment of Animal Science, College of Agricultural Engineering Sciences, University of Sulaimani, Al-Sulaimaniyah, Kurdistan Region, Iraq.Journal Article20210303The study was on 120 one-day-old Ross 308 broiler chicks were housed in the well-ventilated hall already antiseptic. Studied the frequency of feeding at different times in the broiler field at Department of Animal Science, College of Agricultural Engineering Sciences at the University of Sulaimani,. In the first two weeks, all chicks were fed a regular starter diet contains 21.8% crude protein and 3049 kcal metabolizable energy/kg feed. At the start of the third week, all chicks were weighed and divided randomly into four experimental groups, each with 3- replicates (10 birds/replicate). The first group was control (ad libitum feeding) (T1), while the second group (T2) was fed 4 times a day. The third group (T3) was fed 3 times a day, and the fourth group (T4) was fed 2 times a day. The light was kept at 16L: 8D. All the birds were fed a regular standard feed as described in the recommended protocol (NRC, 1994). There are significant differences at the end of the experiment between transactions, and the third transaction is superior to other transactions in the qualities of final weight gain, nutritional conversion efficiency, and final body weight.https://jappmu.journals.ekb.eg/article_153295_8e3b46ba327c12a7c97f5ce3599dcf44.pdf