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Li C.,Agresearch Ltd. | Yang F.,Chinese Academy of Agricultural Sciences | Yang F.,State Key Laboratory for Molecular Biology of Special Economical Animals | Haines S.,Agresearch Ltd. | And 14 more authors.
Journal of Experimental Zoology Part B: Molecular and Developmental Evolution | Year: 2010

Antlers offer a unique model for the study of whether regeneration recapitulates development in a mammalian organ. Research, to date, supports the full recapitulation in antler, but a recent report that subcutaneously transplanted (ST) pedicle periosteum (PP) failed to induce that ectopic antler formation could argue against recapitulation, as antlerogenic periosteum (AP) can readily do so. However, it was not clear in that study whether the result was caused by inability of the PP to interact with the skin or owing to failure to create the required close contact to it. This study was designed to clarify this uncertainty by adopting intradermal transplantation (IT) to achieve the required close contact without the need for significant mass expansion. The results showed that IT of 1/8 of the original AP mass or more was sufficient for antler induction, whereas ST of 1/4-AP or less could not do so within 2 years. The minimum amount of AP required for antler induction using the IT approach was somewhere between 1/8 and 1/12-AP (<30mg). The results further demonstrated that IT of 62-84mg PP failed to induce ectopic antler formation, even if the PP had fused with the surrounding skin. Because this mass of PP was 2-3 times the minimum amount of AP required for antler induction, we conclude that PP does not recapitulate AP in induction of ectopic antler development. It is likely that PP has been restricted for antler regeneration and lost the potential to initiate antler development. © 2010 Wiley-Liss, Inc., A Wiley Company.

Zhang H.-h.,Chinese Academy of Agricultural Sciences | Zhang H.-h.,Jilin Provincial Key Laboratory for Molecular Biology of Special Economic Animals | Zhang H.-h.,State Key Laboratory for Molecular Biology of Special Economical Animals | Li G.-y.,Chinese Academy of Agricultural Sciences | And 14 more authors.
Journal of Forestry Research | Year: 2012

A study was conducted to evaluate production performance of minks in growing-furring period with supplementing DL-Methionine (Met) in low protein diet. Seventy healthy male minks were randomly divided into five groups of 14 minks each. The minks were fed in five kinds of experiment diets (HP, LP, LP+M1, LP+M2 and LP+M3). The dietary protein levels, expressed as percentage of dry matter (DM), were 32% (high protein, HP) and 24% (low protein, LP). LP was supplemented with Met 0. 4% (M1), 0. 8% (M2) and 1. 2% (M3) DM. From mid of September to December 10, apparent digestibility of CP (crude protein), N intake and urinary N excretion were decreased with declining dietary protein levels (p < 0. 05) and N retained was the highest in treatment LP+M2. No significant difference was found in total serum protein (TP) and serum urea nitrogen (SUN) among all treatment groups (p > 0. 05). Skin length of treatment HP and LP+M2 was higher than that of other groups (p < 0. 05). Body length, skin weight, length of guard hair and under hair were not affected by different dietary protein levels (p>0. 05). The best performance could be observed in treatment LP+M2. In diet, 24% (DM) protein level with 1. 54% Met supplementing was enough for minks during growing-furring period. Dietary protein lowered from 32% to 24% with supplementing Met in diets would result in a 37. 9% decrease in urinary N excretion. Furthermore, addition of Met in diets for minks would be beneficial in terms of reducing feed expenses and lessening nitrogen emissions to the environment. © 2012 Northeast Forestry University and Springer-Verlag Berlin Heidelberg.

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