The Experts below are selected from a list of 35151 Experts worldwide ranked by ideXlab platform
George E. Seidel - One of the best experts on this subject based on the ideXlab platform.
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Experimental design, power and sample size for Animal Reproduction experiments.
Reproduction fertility and development, 2008Co-Authors: Phillip L. Chapman, George E. SeidelAbstract:The present paper concerns statistical issues in the design of Animal Reproduction experiments, with emphasis on the problems of sample size determination and power calculations. We include examples and non-technical discussions aimed at helping researchers avoid serious errors that may invalidate or seriously impair the validity of conclusions from experiments. Screen shots from interactive power calculation programs and basic SAS power calculation programs are presented to aid in understanding statistical power and computing power in some common experimental situations. Practical issues that are common to most statistical design problems are briefly discussed. These include one-sided hypothesis tests, power level criteria, equality of within-group variances, transformations of response variables to achieve variance equality, optimal specification of treatment group sizes, ‘post hoc’ power analysis and arguments for the increased use of confidence intervals in place of hypothesis tests.
Wang Li-qiang - One of the best experts on this subject based on the ideXlab platform.
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The Establishment and Application of Open and Innovative Teaching Model of Animal Reproduction
2012Co-Authors: Wang Li-qiangAbstract:To meet the demand of innovative talents of society,improve the comprehensive quality and practical ability of college students,and culture the sense of innovation and innovation capacity,the teaching contents of the course of Animal Reproduction were optimized,the experimental teaching program was adjusted,and the models of practice teaching and assessment methods were reformed.The teaching system of Animal Reproduction and teaching effectiveness will be established by using the open teaching resources and exploring the practical teaching system combined production teaching with research.
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Study on the Teaching Reform of Animal Reproduction
2011Co-Authors: Wang Li-qiangAbstract:Animal Reproduction is one of the most important specialized core course of Animal science major,and it is also a subject with operability,with its theory closely related with practice.In order to help and guide students to grasp new knowledge and content about Animal Reproduction better and faster,stimulate the enthusiasm and interest of students,enforce students' initiative and improve the teaching effect of Animal Reproduction in a relatively short period of teaching time,the article discussed the teaching system reform of Animal Reproduction from three aspects as the optimization of teaching content,reform of teaching methods and improvement of teaching methods.
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Study on the Teaching Reformation of Animal Reproduction
Journal of Yangling Vocational & Technical College, 2010Co-Authors: Wang Li-qiangAbstract:Animal Reproduction is an important specialized basic course of Animal science specialty,with its theory tightly related with practice.It is very important that teachers should help and guide students to grasp new knowledge and content better and faster.In the teaching of Animal Reproduction,it requires that teachers must to improve their own quality unceasingly,rationally design teaching scheme and content,use effective teaching utensils,mobilize the enthusiasm and interest of students,enforce students' initiative,put the theory into practice and cultivate students' comprehensive ability,to finally improve the teaching effect of Animal Reproduction
Raffaele Luigi Sciorsci - One of the best experts on this subject based on the ideXlab platform.
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Alpha-fetoprotein in Animal Reproduction.
Research in veterinary science, 2019Co-Authors: Annalisa Rizzo, M. Galgano, M. Mutinati, Raffaele Luigi SciorsciAbstract:Abstract Alpha-fetoprotein (AFP) is a serum glycoprotein with structural and physico-chemical properties similar to albumin. However, the exact physiological functions of AFP remain unknown; those known to date include markers to pathological conditions including neoplastic and non-neoplastic diseases, antioxidant effects, growth regulator in different cells and in cancer, immune response modulator, and carrier for fatty acids and oestrogens. This review aimed to present an overview of the different functions of AFP, particularly its role in the sexual differentiation of the hypothalamus, because its ability to bind oestrogens prevents their passage to the brain, where they inhibit the surge centre development. AFP and anti-Mullerian hormone are known to be involved in the development of freemartins, or genetically female foetuses masculinised in the presence of a male co-twin.
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Role of homocysteine metabolism in Animal Reproduction: A review.
Research in veterinary science, 2018Co-Authors: Annalisa Rizzo, Raffaele Luigi SciorsciAbstract:Homocysteine (Hcy) is a thiol-containing essential amino acid, important for the growth of cells and tissues. Several hypotheses exist regarding Hcy toxicity in humans; Hcy is involved in protein structural modifications, oxidative stress, and neurotoxicity induction and is therefore associated with several pathological conditions in humans. In veterinary science, knowledge regarding Hcy has increased recently due to several studies; however, many aspects remain undiscovered. Many details remain unknown regarding the effect of Hcy levels on pregnancy and the optimal management of pathological conditions associated with Hcy levels during pregnancy in various species. In this review, we aimed to compile various studies on Hcy metabolism to elucidate its current status in the veterinary field, particularly for ovine, bovine, equine, porcine, canine, and feline species.
Phillip L. Chapman - One of the best experts on this subject based on the ideXlab platform.
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Experimental design, power and sample size for Animal Reproduction experiments.
Reproduction fertility and development, 2008Co-Authors: Phillip L. Chapman, George E. SeidelAbstract:The present paper concerns statistical issues in the design of Animal Reproduction experiments, with emphasis on the problems of sample size determination and power calculations. We include examples and non-technical discussions aimed at helping researchers avoid serious errors that may invalidate or seriously impair the validity of conclusions from experiments. Screen shots from interactive power calculation programs and basic SAS power calculation programs are presented to aid in understanding statistical power and computing power in some common experimental situations. Practical issues that are common to most statistical design problems are briefly discussed. These include one-sided hypothesis tests, power level criteria, equality of within-group variances, transformations of response variables to achieve variance equality, optimal specification of treatment group sizes, ‘post hoc’ power analysis and arguments for the increased use of confidence intervals in place of hypothesis tests.
Halina Kozlowska - One of the best experts on this subject based on the ideXlab platform.
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Rapeseed meal‐glucosinolates and their antinutritional effects Part 5. Animal Reproduction
Die Nahrung, 1994Co-Authors: R. Mawson, R. K. Heaney, Z. Zdunczyk, Halina KozlowskaAbstract:Although there is no clear evidence to fully describe the mechanism involved in glucosinolate-related effects on Animal Reproduction, lowered fertility in Animals fed diets with rapeseed meal (RSM) inclusion is related to glucosinolate content in the diet. Negative effects can result both from multidirectional action of glucosinolates, malnutrition of mother due to the thyroid dysfunction, transfer of goitrogenic compounds to foetus and reduced transfer of nutritive compounds (e.g. iodine) through the placenta. The degree of Reproduction impairment depends both on glucosinolate content and on the type of Animal. Pregnant female rats are sensitive to the presence of glucosinolates, and the first symptoms of fertility impairment and lowering of offspring survival rate may occur at low glucosinolate levels, e.g. with diets containing low glucosinolate rapeseed meal (LG-RSM). In the case of swine, the limiting value above which sows fertility may be impaired is 4 μmol of total glucosinolates per g diet and 8 mmol of daily intake of these compounds. Opinions on the permitted RSM inclusion in diet for hens are very divergent. Some authors recommend limiting of the RSM inclusion to 10%, while others did not find any lowering of egg production in hens fed diets with two- or three-fold greater RSM inclusion rates. Most long-term experiments with heifers, cows and ewes indicate that ruminants tolerate the level of glucosinolate in LG-RSM although feeding this fodder as the only high-protein concentrate component may lead to impaired fertility. Rapssamenmehl-Glucosinolate und ihre antinutritiven Effekte. 5. Mitt. Tier-Reproduktion Obwohl Beweise fur die vollstandige Beschreibung der Mechanismen bei Glucosinolat-Effekten auf die tierische Reproduktion fehlen, wird doch die verminderte Fertilitat von Tieren, deren Futter Rapssamenmehl (RSM) enthalt, auf den Glucosinolatgehalt des Futters zuruckgefuhrt. Negative Effekte konnen auf folgenden Ursachen beruhen: Vielseitige Wirkung von Glucosinolaten, Fehlernahrung des Muttertieres wegen der Thyreodysfunktion, Transfer goitrogener Verbindungen in den Fetus und reduzierter Transfer nutritiver Verbindungen (z. B. Jod) durch die Plazenta. Der Grad der Beeintrachtigung der Reproduktion beruht auf dem Glucosinolatgehalt und auf der Tierart. Tragende weibliche Ratten sind empfindlich gegenuber der Anwesenheit von Glucosinolaten. Die ersten Symptome einer Fertilitats-Beeintrachtigung und Erniedrigung der Uberlebensrate der Nachkommen konnen bereits bei niedrigen Glucosinolatmengen im Futter auftreten, z. B. bei 10% Rapssamenmehl mit niedrigem Glucosinolatgehalt (LG-RSM). Bei Schweinen liegt der Grenzwert fur Fertilitatsbeeintrachtigung von Sauen bei 4 μmol Gesamtglucosinolat pro g Futter und 8 mmol taglicher Aufnahme dieser Verbindungen. Die Meinungen uber die zulassigen RSM-Anteile im Futter fur Hennen sind sehr unterschiedlich. Einige Autoren empfehlen Grenzwerte fur den RSM-Anteil von 10%, wahrend andere keine Erniedrigung der Eiproduktion von Hennen feststellen, deren Futter zwei- oder dreifach hohere RSM-Gehalte aufweisen.
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rapeseed meal glucosinolates and their antinutritional effects part 5 Animal Reproduction
Nahrung-food, 1994Co-Authors: R. Mawson, R. K. Heaney, Z. Zdunczyk, Halina KozlowskaAbstract:Although there is no clear evidence to fully describe the mechanism involved in glucosinolate-related effects on Animal Reproduction, lowered fertility in Animals fed diets with rapeseed meal (RSM) inclusion is related to glucosinolate content in the diet. Negative effects can result both from multidirectional action of glucosinolates, malnutrition of mother due to the thyroid dysfunction, transfer of goitrogenic compounds to foetus and reduced transfer of nutritive compounds (e.g. iodine) through the placenta. The degree of Reproduction impairment depends both on glucosinolate content and on the type of Animal. Pregnant female rats are sensitive to the presence of glucosinolates, and the first symptoms of fertility impairment and lowering of offspring survival rate may occur at low glucosinolate levels, e.g. with diets containing low glucosinolate rapeseed meal (LG-RSM). In the case of swine, the limiting value above which sows fertility may be impaired is 4 μmol of total glucosinolates per g diet and 8 mmol of daily intake of these compounds. Opinions on the permitted RSM inclusion in diet for hens are very divergent. Some authors recommend limiting of the RSM inclusion to 10%, while others did not find any lowering of egg production in hens fed diets with two- or three-fold greater RSM inclusion rates. Most long-term experiments with heifers, cows and ewes indicate that ruminants tolerate the level of glucosinolate in LG-RSM although feeding this fodder as the only high-protein concentrate component may lead to impaired fertility. Rapssamenmehl-Glucosinolate und ihre antinutritiven Effekte. 5. Mitt. Tier-Reproduktion Obwohl Beweise fur die vollstandige Beschreibung der Mechanismen bei Glucosinolat-Effekten auf die tierische Reproduktion fehlen, wird doch die verminderte Fertilitat von Tieren, deren Futter Rapssamenmehl (RSM) enthalt, auf den Glucosinolatgehalt des Futters zuruckgefuhrt. Negative Effekte konnen auf folgenden Ursachen beruhen: Vielseitige Wirkung von Glucosinolaten, Fehlernahrung des Muttertieres wegen der Thyreodysfunktion, Transfer goitrogener Verbindungen in den Fetus und reduzierter Transfer nutritiver Verbindungen (z. B. Jod) durch die Plazenta. Der Grad der Beeintrachtigung der Reproduktion beruht auf dem Glucosinolatgehalt und auf der Tierart. Tragende weibliche Ratten sind empfindlich gegenuber der Anwesenheit von Glucosinolaten. Die ersten Symptome einer Fertilitats-Beeintrachtigung und Erniedrigung der Uberlebensrate der Nachkommen konnen bereits bei niedrigen Glucosinolatmengen im Futter auftreten, z. B. bei 10% Rapssamenmehl mit niedrigem Glucosinolatgehalt (LG-RSM). Bei Schweinen liegt der Grenzwert fur Fertilitatsbeeintrachtigung von Sauen bei 4 μmol Gesamtglucosinolat pro g Futter und 8 mmol taglicher Aufnahme dieser Verbindungen. Die Meinungen uber die zulassigen RSM-Anteile im Futter fur Hennen sind sehr unterschiedlich. Einige Autoren empfehlen Grenzwerte fur den RSM-Anteil von 10%, wahrend andere keine Erniedrigung der Eiproduktion von Hennen feststellen, deren Futter zwei- oder dreifach hohere RSM-Gehalte aufweisen.
