This study evaluated the effects of dietary fat levels on the growth, nutrient digestibility, nitrogen balance and pelt characteristics of the blue fox(Alopex lagopus). Age-matched blue foxes(12 weeks old) with simila...This study evaluated the effects of dietary fat levels on the growth, nutrient digestibility, nitrogen balance and pelt characteristics of the blue fox(Alopex lagopus). Age-matched blue foxes(12 weeks old) with similar body weights were randomly divided into six dietary groups over 98 days, during the growing-furring period. Blue foxes in the six groups were fed with experimental diets containing 10%(groupⅠ), 12%(groupⅡ), 14%(group Ⅲ), 16%(group Ⅳ), 18%(groupⅤ) and 20%(group Ⅵ) fat during the growing period(from 13 weeks to 18 weeks of age);foxes were fed with diets containing 12%(groupⅠ), 14%(groupⅡ), 16%(group Ⅲ), 18%(group Ⅳ), 20%(groupⅤ) and 22%(group Ⅵ) fat during the furring period(from 18 weeks to 26 weeks of age). The results indicated that 16%-18% dietary fat, during the growing period significantly improved nutrient utilization, and as a main energy source, significantly reduced the feed/gain ratio. A dietary fat level of 18%, during the furring period not only improved the growth and development and decreased the feed/gain ratio, but also increased nutrient digestibility and fur quality. These data, combined with data from a conic regression model, showed that dietary fat levels between 16.29% and 18.40%, during the growing period and between 17.72% and 18.72%, during the furring period enhanced the growth performance and fur quality of blue foxes.展开更多
A study was conducted to evaluate production performance of minks in growing-furring period with supplementing DL-Methinnine(Met)in low protein diet.Seventy healthy male minks were randomly divided into five groups of...A study was conducted to evaluate production performance of minks in growing-furring period with supplementing DL-Methinnine(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 supple-mented 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 pro-tein),N intake and urinary N excretion were decreased with declining dietary protein levels(p〈0.05)and N retained was the highest in treat-ment 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-farring period.Dietary protein lowered from 32%to 24%with supplementing Met in diets would result in a37.9%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.展开更多
My favourite pet is a lovely dog.I bought him last year in the pet market.He has long ears,a long body and brown fur.He is very small.He weights①about one kilogram.He is very active.He wants to catch everything.Every...My favourite pet is a lovely dog.I bought him last year in the pet market.He has long ears,a long body and brown fur.He is very small.He weights①about one kilogram.He is very active.He wants to catch everything.Every day he runs here and there.But if you want him to do something,he will be a very good boy.展开更多
Identification keys for terrestrial small mammals are often based on scientific details that require close examination of museum specimens.This paper builds on external morphological characteristics of the rodents rec...Identification keys for terrestrial small mammals are often based on scientific details that require close examination of museum specimens.This paper builds on external morphological characteristics of the rodents recorded through live trapping from 2011 to 2023 in Nyungwe National Park,a tropical rainforest in Rwanda,to formulate a taxonomic key suitable for both expert and non-expert researchers working in similar ecosystems across Africa.We reviewed the literature on taxonomic keys and field guide documents for small mammals to assess their practicality and identify gaps,with a special focus on their relevance to tropical regions and our study area.We then integrated our field records to harmonize this new development.We describe 23 rodent species,identified and confirmed using advanced taxonomic techniques,including DNA barcoding and voucher specimens.The study emphasizes that external features—particularly field photographs,body coloration(dorsal,ventral,and lateral views),and other distinctive anatomical traits—can serve as an effective field taxonomic key for rodents and other terrestrial small mammals,accessible to a broad scientific community.The paper also discusses the limitations of traditional dichotomous keys compared to short descriptions paired with photographic illustrations.The resulting key can be used as a template and is open to refinement as additional species are confirmed,re-assessed,or validated through advanced tools.Future studies may adapt this approach for other terrestrial small mammals and different locations across African tropical rainforests.展开更多
Labubu has become a global star,from Paris and New York to London and Milan.These charming figurines from Chinese toy manufacturer Pop Mart,with their soft fur,expressive eyes,pointed teeth and rabbit ears,have captiv...Labubu has become a global star,from Paris and New York to London and Milan.These charming figurines from Chinese toy manufacturer Pop Mart,with their soft fur,expressive eyes,pointed teeth and rabbit ears,have captivated buyers both in shops and online.展开更多
主题语境:动物特性,篇幅:335词,建议用时:7分钟,Polar bears possess a remarkable ability to prevent ice from forming on their fur,a characteristic that has long been recognized by Indigenous Arctic peoples but only recent...主题语境:动物特性,篇幅:335词,建议用时:7分钟,Polar bears possess a remarkable ability to prevent ice from forming on their fur,a characteristic that has long been recognized by Indigenous Arctic peoples but only recently studied by scientists.Bodil Holst,a physicist from the University of Bergen in Norway,discovered that the ice resistance of polar bear fur is due to natural oils secreted(分泌)onto the hairs,rather than the fur itself.This finding came from Holsts observation that polar bears,despite having freezing fur temperatures,never appeared with ice buildup in wildlife documentaries.展开更多
基金Supported by the Harbin Applied Technology Research and Development Project(2016RAXXJ015)
文摘This study evaluated the effects of dietary fat levels on the growth, nutrient digestibility, nitrogen balance and pelt characteristics of the blue fox(Alopex lagopus). Age-matched blue foxes(12 weeks old) with similar body weights were randomly divided into six dietary groups over 98 days, during the growing-furring period. Blue foxes in the six groups were fed with experimental diets containing 10%(groupⅠ), 12%(groupⅡ), 14%(group Ⅲ), 16%(group Ⅳ), 18%(groupⅤ) and 20%(group Ⅵ) fat during the growing period(from 13 weeks to 18 weeks of age);foxes were fed with diets containing 12%(groupⅠ), 14%(groupⅡ), 16%(group Ⅲ), 18%(group Ⅳ), 20%(groupⅤ) and 22%(group Ⅵ) fat during the furring period(from 18 weeks to 26 weeks of age). The results indicated that 16%-18% dietary fat, during the growing period significantly improved nutrient utilization, and as a main energy source, significantly reduced the feed/gain ratio. A dietary fat level of 18%, during the furring period not only improved the growth and development and decreased the feed/gain ratio, but also increased nutrient digestibility and fur quality. These data, combined with data from a conic regression model, showed that dietary fat levels between 16.29% and 18.40%, during the growing period and between 17.72% and 18.72%, during the furring period enhanced the growth performance and fur quality of blue foxes.
基金supported by Special Fund for Public Welfare Technology Research of Agricultural Industry(200903014)
文摘A study was conducted to evaluate production performance of minks in growing-furring period with supplementing DL-Methinnine(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 supple-mented 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 pro-tein),N intake and urinary N excretion were decreased with declining dietary protein levels(p〈0.05)and N retained was the highest in treat-ment 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-farring period.Dietary protein lowered from 32%to 24%with supplementing Met in diets would result in a37.9%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.
文摘My favourite pet is a lovely dog.I bought him last year in the pet market.He has long ears,a long body and brown fur.He is very small.He weights①about one kilogram.He is very active.He wants to catch everything.Every day he runs here and there.But if you want him to do something,he will be a very good boy.
文摘Identification keys for terrestrial small mammals are often based on scientific details that require close examination of museum specimens.This paper builds on external morphological characteristics of the rodents recorded through live trapping from 2011 to 2023 in Nyungwe National Park,a tropical rainforest in Rwanda,to formulate a taxonomic key suitable for both expert and non-expert researchers working in similar ecosystems across Africa.We reviewed the literature on taxonomic keys and field guide documents for small mammals to assess their practicality and identify gaps,with a special focus on their relevance to tropical regions and our study area.We then integrated our field records to harmonize this new development.We describe 23 rodent species,identified and confirmed using advanced taxonomic techniques,including DNA barcoding and voucher specimens.The study emphasizes that external features—particularly field photographs,body coloration(dorsal,ventral,and lateral views),and other distinctive anatomical traits—can serve as an effective field taxonomic key for rodents and other terrestrial small mammals,accessible to a broad scientific community.The paper also discusses the limitations of traditional dichotomous keys compared to short descriptions paired with photographic illustrations.The resulting key can be used as a template and is open to refinement as additional species are confirmed,re-assessed,or validated through advanced tools.Future studies may adapt this approach for other terrestrial small mammals and different locations across African tropical rainforests.
文摘Labubu has become a global star,from Paris and New York to London and Milan.These charming figurines from Chinese toy manufacturer Pop Mart,with their soft fur,expressive eyes,pointed teeth and rabbit ears,have captivated buyers both in shops and online.
文摘主题语境:动物特性,篇幅:335词,建议用时:7分钟,Polar bears possess a remarkable ability to prevent ice from forming on their fur,a characteristic that has long been recognized by Indigenous Arctic peoples but only recently studied by scientists.Bodil Holst,a physicist from the University of Bergen in Norway,discovered that the ice resistance of polar bear fur is due to natural oils secreted(分泌)onto the hairs,rather than the fur itself.This finding came from Holsts observation that polar bears,despite having freezing fur temperatures,never appeared with ice buildup in wildlife documentaries.
