A total number of 24 mature New Zealand White (NZW) rabbits, was used in this work to determine some physiological reactions of rabbit does as affected by housing system (indoors versus outdoors housing) during Egyptian summer season conditions. Also, to ameliorate the adverse effects of stressful summer conditions by using highly concentrated nutritional supplement (Synertox® component). The animals were equally and randomly divided into two groups each of 12 does. In each group, 6 does received water plus Synertox and the other 6 does did not receive Synertox (control). Results showed that, the average values of rectal (RT) temperature was significantly lower in outdoors housing as compared to indoors one, and in the group received Synertox. The lowest and highest values of respiration rate (RR) were obtained in outdoors and indoors housing, respectively, for both control and treated groups. Synertox treatment caused significant (P≤0.01) decrease in RR in both housing models. The values of hematocrit, hemoglobin, red and white blood cells count, total proteins, albumin, aspartate and alanine aminotransferases, creatinine, urea-nitrogen and triiodothyronine, thyroxine hormone concentrations were significantly (P≤0.05) higher in does kept in outdoors housing than those kept in the indoors model. Treatment with Synertox caused significantly (P≤0.05) increase in most of these values under indoors housing condition. Conclusively, it can be concluded that, in spite of indoors housing "double iron sheets roof" accommodate and ideal house for raising rabbits but the good ventilation and absence of walls and its
A total number of 90 APRI rabbits at 5 weeks of age were divided into nine treatments, 10 rabbits each, to investigate the effect of different dietary digestible energy (DE) and crude protein (CP) levels in a 3x3 factorial design on rabbits growth performance, carcass traits, blood plasma constituents and nutrients digestibility during the fattening period (5-13 weeks of age). Rabbits were fed different three levels of DE 2500, 2600, and 2700 kcal DE/kg diet each with 14, 16 and 18 % CP level. The results showed that the highest body weight, daily weight gain and growth performance were obtained with 2600 Kcal DE/Kg diet followed by those fed diet containing 2500 Kcal DE. Increasing dietary protein to 16% CP significantly increased live body weight, daily weight gain, growth performance and performance index and improved feed conversion ratio. There were no significant effect due to DE or protein levels on digestibility coefficient of DM, OM, EE and NFE, while fiber digestibility coefficient decreased with increasing DE. Crude protein digestibility coefficient increased by increasing protein level. There were no significant effect on plasma constituents due to energy levels except in case of triglycerides and cholesterol. CP levels affected significantly on total protein, albumin, globulin and creatinine. Increasing CP increased total edible parts, while no significant differences could be detected due to DE levels. Meat content of DM, CP and EE were increased by increasing DE and protein level. In conclusion the optimal protein and energy levels for APRI rabbits in the present study are 16% CP with 2500 kcal DE/kg diet to maximize the productive performance and economic efficiency.
Eighty primiparous Bauscat doe rabbits, aged 10-11 months with an average initial body weight, 3886.84 ± 64.79 g and 24 fertile Buck rabbis aged 6-7 months with an average initial body weight3123.75±119.28g were divided randomly into four comparable groups. The 1 st group was used as control contained a common trace mineral supplement (Fe, Zn, Cu. Mn and Co) in Vitamin and Mineral primed and 2 nd , 3 rd and 4 th groups contained Bioplex trace minerals products (Bioplex TM ) at 25 %, 50% and 100% of the common trace mineral supplemented levels, respectively. Number of services per conception, litter size, litter weight (g), bunny weight (g) at birth, 21 and 28 days were recorded. Semen quality of bucks was determined including ejaculate volume (ml), wave motion (scores), sperm motility (%), sperm concentration (x 10 6 /ml), dead and abnormal spermatozoa (%) .Litter weight at 21 days, 28 days of age, mean bunny weight at birth and at 21 days and litter weight gain from birth up to 28 days were significantly higher (P <0.05) with supplemented group at level of 50% of Bioplex TM than the treated groups with 25 % and 100% of Bioplex TM and untreated does (control). However, number of services per conception, gestation length, litter size at birth, 21 and at weaning (28 days) and litter weight at birth, mean bunny weight at 28 days, litter weight gain from 21 to 28 days and pre-weaning mortality rate were insignificantly affected by supplementation of Bioplex TM .Most of doe and offspring traits were not affected significantly by the number of parity of Bouscat doe rabbits. However, mean bunny weight at birth and litter weight gain from 21 to 28 days were significantly (P < 0.05). Pre-weaning mortality percentage from birth to 28 days were lower significantly (P< 0.05) in the 1 st parity than in the 2 nd ones.Level of blood serum total protein, urea-N, aspartate aminotransferase (AST), alanine aminotransferase (ALT) were significantly (P< 0.01 or P< 0.05) higher in doe rabbis supplemented with Bioplex TM . However, level of blood serum total lipids, and cholesterol were significantly lower (P < 0.01) in rabbits treated with 50% and 100% Bioplex TM as compared to those of treated with 25% Bioplex TM or those of the control group. Levels of blood serum creatinine, serum blood minerals (Ca, P, K, Na, Ca/P and Na/K)and serum blood hormones (progesterone and prolactin) were not affected significantly by supplemental levels of Bioplex TM . Supplementation of Bioplex TM significantly (P< 0.01 or P< 0.050 improved semen quality of buck rabbits. The buck rabbits received the additional level of 100 % Bioplex TM showed the best physical semen characteristics as compared to buck rabbits received the additional level of 25 % and 50 % of Bioplex TM and AST was the highest one, while, cholesterol and ALT were (P<0.05 or P .01) the lowest one. However, levels of blood serum AST significantly (P< 0.05) higher in the buck rabbits fed diets supplemented with the level of 100% of Bioplex TM than the other groups.
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