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1. Effects of exogenous metallothionein on several endocrine hubs of dairy cattles | |||
Wu Lizhuan,Chen Haiyan,Zhang Bin,Li Lili,Xiao Bingnan,Chen Yuguang,Xiao Dingfu,Luo Jiajie,Wu Zongming | |||
Animal Husbandry, Veterinary Medicine 26 January 2010 | |||
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Abstract:To approach the effects of exogenous metallothionein (Zn-MT) on endocrine hubs of dairy cattles on the low-grade thermal stress, an experiment was conducted with 24 lactating cows, who were randomly allocated to groups A, B, C and D, and supplemented with 0, 6.0, 12.0 and 16.0mg Zn-MT•capita-1, respectively, by intravenous injection. The results showed that: The corrected milk yields in groups B, C and D were higher than those in groups A (P<0.05or P<0.01), the fat percentages of milk was improved significantly (P<0.05). The secretory capacity of INS in control group was lower than in experimental groups, especially in group B in 30d(P<0.01); the secretory capacity of IGF-Ⅰand T3 in groups B, C and D were higher than those in groups A (P<0.05or P<0.01), and in 45d, the same capacity in group C was the highest among all these numbers. The FSH in groups B and C constantly maintained low level, but the range of variation of FSH in group A was 4 times as same as in group C; The secretory capacity of Prog and E2 in experimental groups were higher than those of group A in anaphase (30~45d)(P<0.05); and the PRL in groups B, C and D were higher significantly than those in groups A (P<0.01), and the effect was faint in anaphase (P>0.05). Exogenous Zn-MT had the best effects on the thermoresistance of diary cattle 12.0mg•capita-1 by intravenous injection every 30~45 days. On one hand, the speed of catabolism and quantity of heat production in bodies were reduced by Zn-MT through adjusting secretory volume of endocrine hormone which is related to energy metabolism, on the other hand, to approach the healthful effects of thermoresistance, the gonadal hormones were controlled amplitude of variation, and on the same time, the secretory volume of PRL was improved by Zn-MT, which resulted in physiological status which was varied on balance for diary cattle. | |||
TO cite this article:Wu Lizhuan,Chen Haiyan,Zhang Bin, et al. Effects of exogenous metallothionein on several endocrine hubs of dairy cattles[OL].[26 January 2010] http://en.paper.edu.cn/en_releasepaper/content/39410 |
2. Effects of Crude Enzyme Preparation Supplemented | |||
Xiaojie Ai,Zhengkang Han | |||
Animal Husbandry, Veterinary Medicine 09 December 2005 | |||
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Abstract:Twenty four 7-day-old crossbred goslings (Chuan white×Tai lake) were divided randomly into control and treatment groups. Enzyme preparation was added in the diet of treatment group at dosage of 1 g/kg. The blood samples were collected from 60 day-old goslings via the wing vein. During the fifty-three days experiment, body weights were adopted measured each week, related hormone contents and biochemical parameters in plasma were determined. The results were as following:(1) Compared with control, body weight of treatment group were significantly higher (P<0.05) since 3-week-old goslings. The weight gains were significant higher (P<0.05) in 4~7 week-old goslings too, feed intake were increased and the “feed: body weight gain” was decreased; (2) Compared with control, growth hormone (GH) and insulin-like growth factor-I (IGF-I) levels were dramatically enhanced by 36.62 % (P<0.01) and 66.55 % (P<0.01) respectively, while the level of β-endorphin (β-END) decreased by 51.66 % (P<0.01); (3) Thyroid-stimulating hormone (TSH) and 3,3\ | |||
TO cite this article:Xiaojie Ai,Zhengkang Han. Effects of Crude Enzyme Preparation Supplemented [J].Journal of Shanghai Jiaotong University(Science) ,2005年,E-10卷,sup1期,115 ~ 119 |
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