检索结果-南通市图书馆

Beneficial effects of a decreased meal frequency on nutrient utilization,secretion of luteinizing hormones and ovarian follicular development in gilts

引用

Journal of Animal Science and Biotechnology 2021年第3期12卷 1098-1111页

作者： Lun Hua Lianpeng Zhao Zhengyu Mao Wentao Li Jing Li Xuemei Jiang Lianqiang Che Shengyu Xu Yan Lin Zhengfeng Fang Bin Feng De Wu Yong Zhuo Animal Nutrition Institute Sichuan Agricultural UniversityChengdu 611130People’s Republic of China Key Laboratory for Animal Disease-Resistant Nutrition of the Ministry of Education of China Sichuan Agricultural UniversityChengdu 611130People’s Republic of China Key Laboratory of Animal Disease-Resistant Nutrition of Sichuan Province Sichuan Agricultural University211 Huimin RoadWenjiang DistrictChengdu 611130People’s Republic of China

Background:Replacement gilts are typically fed ad libitum,whereas emerging evidence from human and rodent studies has revealed that time-restricted access to food has health *** objective of this study was to investigate the effect of meal frequency on the metabolic status and ovarian follicular development in ***:A total of 36 gilts(Landrace×Yorkshire)with an age of 150±3 d and a body weight of 77.6±3.8 kg were randomly allocated into one of three groups(n=12 in each group),and based on the group allocation,the gilts were fed at a frequency of one meal(T1),two meals(T2),or six meals per day(T6)for 14 consecutive *** effects of the meal frequency on growth preference,nutrient utilization,short-chain fatty acid production by gut microbial,the post-meal dynamics in the metabolic status,reproductive hormone secretions,and ovarian follicular development in the gilts were ***:The gilts in the T1 group presented a higher average daily gain(+48 g/d,Pgilts exhibited a greater NDF digestibility than the T6 gilts(Pgilts presented decreased urine excretion of nitrogen(−8.17 g/d,Pgilts also had a higher acetate content and SCFAs in feces than the T6 gilts(Pgilts at first estrous expression were not affected by the meal frequency,but the gilts in the T1 group had higher levels of seru

关键词： gilts Luteinizing hormone Meal frequency Nutrient utilization Ovarian follicular development

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Current strategies for reproductive management of gilts and sows in North America

引用

Journal of Animal Science and Biotechnology 2015年第2期6卷 191-204页

作者： Robert R Kraeling Stephen K Webel L&R Research Associates JBS United Animal Health

Many advances in genetic selection, nutrition, housing and disease control have been incorporated into modern pork production since the 1950s resulting in highly prolific females and practices and technologies, which significantly increased efficiency of reproduction in the breeding herd. The objective of this manuscript is to review the literature and current industry practices employed for reproductive management. In particular the authors focus on assisted reproduction technologies and their application for enhanced productivity. Modern maternal line genotypes have lower appetites and exceptional lean growth potential compared to females of 20 yr ago. Thus, nutrient requirements and management techniques and technologies, which affect gilt development and sow longevity, require continuous updating. Failure to detect estrus accurately has the greatest impact on farrowing rate and litter size. Yet, even accurate estrus detection will not compensate for the variability in the interval between onset of estrus and actual time of ovulation. However, administration of GnRH analogs in weaned sows and in gilts after withdrawal of altrenogest do overcome this variability and thereby synchronize ovulation, which makes fixed-time AI practical. Seasonal infertility, mediated by temperature and photoperiod, is a persistent problem. Training workers in the art of stockmanship is of increasing importance as consumers become more interested in humane animal care. Altrenogest, is used to synchronize the estrous cycle of gilts, to prolong gestation for 2-3 d to synchronize farrowing and to postpone post-weaning estrus. P.G. 600~ is used for induction of estrus in pre-pubertal gilts and as a treatment to overcome seasonal anestrous. Sperm cell numbers/dose of semen is significantly less for post cervical AI than for cervical AI. Real-time ultrasonography is used to determine pregnancy during wk 3-5. PGF2a effectively induces farrowing when administered within two d of normal gestati

关键词： gilts Management Nutrition Reproductive technology Sows

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Evaluation of the Hypothalamic Kisspeptin System throughout the Estrous Cycle in gilts

引用

Open Journal of Animal Sciences 2021年第4期11卷 591-607页

作者： Jeffrey Clapper Eric Jolitz Waljit Dhillo Department of Animal Science South Dakota State University Brookings SD USA Imperial College London at Hammersmith Campus London UK

Kisspeptin has been demonstrated to affect reproductive cyclicity and the attainment of puberty in multiple species, presumably through its actions on gonadotropin releasing hormone and luteinizing hormone. Kisspeptin administration causes increased plasma concentrations of LH in pigs, sheep, and rats. The objective of this experiment was to evaluate changes in the hypothalamic kisspeptin system throughout the estrous cycle in gilts. Estrus was synchronized in forty crossbred gilts (191 d, 121 kg) and estrus detection was performed by exposing gilts to a mature boar. The first day gilts stood immobile was denoted d 1 of the estrous cycle. Blood samples were collected via jugular venipuncture on d 1, 4, 7, 9, 14, 16, and 19 of the estrous cycle. Ten animals were slaughtered on d 1, 9, 14, and 21 of the estrous cycle when medial basal hypothalami, anterior pituitary glands, and blood were collected. Relative expression of hypothalamic kisspeptin (KISS1), kisspeptin receptor (KISS1R), estrogen receptors-a, anterior pituitary gland GnRH receptor, β-actin, and GAPDH was determined using real-time reverse transcriptase PCR. Fold changes in relative expression were determined using the Relative Expression Software Tool. Relative expression of KISS1 was increased (P = 0.006) 3.2 fold on d 1 versus d 21 and 2.3 fold (P = 0.003) on d 9 versus d 21 of the estrous cycle, but was not different (P > 0.05) among the remaining days of the estrous cycle. Relative expressi

关键词： Kisspeptin gilts Estrous Cycle GnRH

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

EFFECT OF DIETARY ENERGY LEVEL AND SOURCES ON BLOOD METABOLITES,HORMONE SECRETION AND REPRODUCTIVE PERFORMANCE IN gilts

EFFECT OF DIETARY ENERGY LEVEL AND SOURCES ON BLOOD METABOLI...

引用

中国畜牧兽医学会动物营养学分会第八届全国会员代表大会暨第十次动物营养学术研讨会

作者： Zhou Dongsheng Wu De Wang Yanzhong Tan Xianyi Zhou Ping Zhuo Yong Animal Nutrition Institute of Sichuan Agricultural University,Key Laboratory for Animal Disease Resistance Nutrition of the Ministry of Education of China,Ya’an 625014,China

The objective of the study was to investigate the effect of dietary energy levels and sources on the blood me- tabolites (Glucose, Triglyeride and Total Cholesterol ), metabolic hormones (Insulin, IGF-Ⅰ and leptin ), reproductive hormones (E2, FSH and LH ) and reproductive performance in gilt. 54gilts with initial body weight of 59±4. 2kg were randomly allotted to six treatments. Treatments were low, medium and high feeding energy level, which were 87.5%, 100% and 112.5% of recommendatory energy requirements by NRC

关键词： Dietary energy level and sources gilts Metabolites Metabolic hormones Reproductive hormones Reproductive performance

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

EFFECT OF FEED INTAKE LEVELS ON EMBRYONIC SURVIVAL AND IMPORTANT DEVELOPMENTAL GENE EXPRESSION DURING EARLY PREGNANCY IN gilts

EFFECT OF FEED INTAKE LEVELS ON EMBRYONIC SURVIVAL AND IMPOR...

引用

中国畜牧兽医学会动物营养学分会第八届全国会员代表大会暨第十次动物营养学术研讨会

作者： Xu Shengyu Wu De Zhang Guo Zheng Airong Guo Haiyan Key Laboratory for Animal Disease Resistance Nutrition of the Ministry of Education of China,Institute of Animal Nutrition,Sichuan Agricultural University,Ya’an 625014,China

In this study, fifty-four gilts at an average weight of 80kg in Landrace × Large white two-way crossbred were used. The crossbred gilts were allotted to three treatment groups of high ( H, 2 × maintenance), medium ( M, 1.2 × maintenance), and low ( L, 0. 6 × maintenance) after mating to study the effect of feed intake lev- el on embryonic survival, hormone secretion and mRNA expression of leptin, obesity receptor ( ob-R), signal

关键词： Feed intake level gilts Embryonic survival Gene expression

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Effects of dietary energy feeding level and source on blood metabolites,hormone secretion and follicular fluid composition in gilts

Effects of dietary energy feeding level and source on blood ...

引用

低碳经济与高效养殖——第六次全国饲料营养学术研讨会暨动物营养学分会成立三十周年大会

作者： D.S.Zhou,Z.F.Fang,D.Wu~*,Y.Zhuo,S.Y.Xu,Y.Z.Wang,P.Zhou,Y.Lin (Key Laboratory for Animal Disease Resistance Nutrition of Ministry of Education of China,Institute of Animal Nutrition,Sichuan Agricultural University,Ya’an 625014,China)

Fifty-four Landrace×Yorkshire crossbred gilts(59.0±4.2 kg and 147±3 days old) were used to examine the effects of dietary energy source(starch or fat,S or F) at high[H-,112.5%of energy requirement recommended by NRC(1998)],normal(N,100%) and low(L,87.5%) energy feeding levels on the blood blood metabolites, hormone secretion and the follicular fluid composition in *** Day 18 after the 2 estrous,serial bloodFifty-four Landrace×Yorkshire crossbred gilts(59.0±4.2 kg and 147±3 days old) were used to examine the effects of dietary energy source(starch or fat,S or F) at high[H-,112.5%of energy requirement recommended by NRC(1998)],normal(N,100%) and low(L,87.5%) energy feeding levels on the blood blood metabolites, hormone secretion and the follicular fluid composition in *** Day 18 after the 2 estrous,serial blood

关键词： dietary energy levels and sources gilts metabolites hormone secretion follicle fluid composition

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

EFFECT OF DIETARY ENERGY LEVEL AND SOURCE ON FOLLICULAR DEVELOPMENT AND OOCYTE MATURATION IN gilts

EFFECT OF DIETARY ENERGY LEVEL AND SOURCE ON FOLLICULAR DEVE...

引用

中国畜牧兽医学会动物营养学分会第八届全国会员代表大会暨第十次动物营养学术研讨会

Our objective was to study the effect of dietary energy level and source on follicular development, follicular fluid composition, oocyte maturation in vitro and oocyte excreted factors, growth differentiation factor9 (GDF- 9), bone morpHogenetic protein15 ( BMP-15 ), luteinizing hormone receptor (LHR) and follicle stimulating hormone receptor (FSHR) mRNA expression from cumulus-oocyte complexes (COCs) during the preovulatory

关键词： Dietary energy level and sources gilts Follicular development Oocytes quality Oocyte excreted factors

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Effect of green forage on development of the reproductive organ and diversity of the gut microbiota in Meishan prepubertal gilts

Effect of green forage on development of the reproductive or...

引用

中国畜牧兽医学会动物微生态学分会第五届第十二次全国学术研讨会

作者： Meng Cao Pan Zhang Yang Li Shengyu Xu Yan Lin Jian Li Bin Feng Lianqiang Che Zhengfeng Fang De Wu Key Laboratory for Animal Disease-Resistant Nutrition of the Ministry of Education of China Animal Nutrition InstituteSichuan Agricultural University

This study was conducted to evaluate the effects of green forage on the onset of puberty and estrus cycle,the development of reproductive organ and diversity of the gut microbiota in Meishan prepubertal *** purebred prepubertal Meishan gilts(ages 93.3 ± 6.8 d;initial body weight 25.3 ± 0.8 kg)were randomly allocated to one of two groups with 10 repeats for each group:control(CON) and Green Forage group(GF).The control basal diets were formulated to meet or exceed Chinese Feeding Standard of Swine(2004).In Green Forage group we used Chinese cabbage instead of part of basal diet with almost iso-energetic and *** control group gilts fed 1.08 kg,1.30 kg,1.64 kg of basal diets(corn-soybean meal diets) per day at stage 1(20-3 0kg),stage 2(30-40kg) and stage 3(40kg to the fourth estrus),*** Green Forage group gilts were fed 1.2kg,1.8kg,2.4kg of Chinese cabbage,and1.02 kg,1.21 kg,1.54 kg of basal diets at stage 1(20-30kg),stage 2(30-40kg) and stage 3(40kg to the fourth estrus),*** age at first estrus of gilts fed green forage was delayed compared with the control gilts(152.4 d vs 135.2 d,P = 0.003).The number of large follicles(>5mm) were increased compared with the control gilts(16.4 vs 12.6,P = 0.041).The concentration of IGF-1 in follicular fluid was increased significantly compared with the control *** was no effect of green forage on estrus cycle and duration of *** gilts fed green forage had higher levels of intestinal microbial richness and biodiversity than the control *** study demonstrates that the green forage can promote the development of reproductive organ in Meishan prepubertal ***,this may be a hint that the improvement of the reproductive organs may be associated with the change of intestinal microorganism.

关键词： gilts green forage reproductive organ intestinal microorganism

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

The appropriate standardized ileal digestible tryptophan to lysine ratio improves pig performance and regulates hormones and muscular amino acid transporters in late finishing gilts fed low-protein diets

The appropriate standardized ileal digestible tryptophan to ...

引用

第七届中国畜牧科技论坛

作者： Ma wenfeng Zhang shihai Zeng xiangfang LIU xutong Xie Chunyuan Zhang guijie Qiao shiyan College of Animal Science and Technology Henan University of Science and Technology State Key Laboratory of Animal Nutrition China Agricultural University

This study investigated the effects of various standardized ileal digestible(SID)Trp to Lys ratios on the performance and carcass characteristics of late finishing gilts receiving low CP(9.6%) diets supplemented with crystalline *** gilts(89.1 ± 5.1 kg) were utilized in a dose-response study conducted for 35 *** Trp(0,0.1,0.2,0.4 or0.6 g/kg) was added to a corn-wheat bran basal diet providing SID Trp to Lys ratios of 0.12,0.15,0.18,0.21 or *** diet was fed to 6 pens of pigs with 3 gilts per *** the end of experiment,30 gilts(one pig per pen) were slaughtered to evaluate carcass traits and meat quality(BW = 121 kg).Increasing the SID Trp to Lys ratio increased ADG(linear and quadratic effect,P<0.05) and also improved G:F(linear and quadratic effect,P<0.05).Serum urea nitrogen(SUN) decreased as the SID Trp to Lys ratio increased(linear and quadratic effects,P<0.05).A quadratic effect of L* light and marbling in the Longissimus dorsi was observed as the dietary SID Trp to Lys ratio increased(P<0.05).Increasing the SID Trp to Lys ratio increased the level of serum GH(quadratic effect,P<0.05) and also increased the level of serum insulin-like growth factor(IGF-1)(linear andquadratic effect,P<0.05).Increasing the SID Trp to Lys ratio increased the protein abundance of the muscular amino acid transporter of sodium-coupled neutral amino acid transporter 2(SNAT2) in the Longissimus dorsi muscle(linear and quadratic effect,P<0.05).The optimum SID Trp to Lys ratios to maximize ADG and G:F as well as to minimize SUN levels were 0.16,0.17 and 0.16 using a linear-break point model and 0.20,0.20 and 0.20 using a quadratic *** may regulate performance by altering the levels of muscular amino acid SNAT2 transporters through the up-regulation of hormones such as GH and IGF-1.

关键词： amino acid transporters gilts hormones low-protein performance tryptophan

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Effects of magnesium on the performance of sows and their piglets

引用

Journal of Animal Science and Biotechnology 2015年第1期6卷 55-62页

作者： Jianjun Zang Jingshu Chen Ji Tian Aina Wang Hong Liu Shengdi Hu Xiangrong Che Yongxi Ma Junjun Wang Chunlin Wang Guanghua Du Xi Ma State Key Laboratory of Animal Nutrition Ministry of Agriculture Feed Industry CentreChina Agricultural University Weifang Business Vocational College College of Animal Science and Veterinary Medicine Shanxi Agricultural University

The objective of this study was to evaluate the effects of supplemental magnesium （Mg） on the performance of gilts and parity 3 sows and their piglets. Fifty-six grits （Trial 1） and 56 sows （Trial 2） were assigned to one of 4 treatments according to their mating weight, respectively. The treatments comprised corn-soybean meal based gestation and lactation diets （0.21% magnesium） supplemented with 0, 0.015, 0.03, or 0.045% Mg from mating until weaning. The results showed that magnesium supplementation significantly （P 〈 0.05） reduced the weaning to estrus interval in both gilts and sows. There were significant effects （P 〈 0.05） of supplemental magnesium on the total number of piglets born, born alive and weaned in sows. In late gestation and lactation, the digestibility of crude fiber （quadratic effects, P 〈 0.05）, and crude protein （P 〈 0.05）, were significantly influenced by magnesium in gilts and sows, respectively. There were differences among the 4 groups in terms of the apparent digestibility of dry matter and crude fiber in sows （P 〈 0.0S） during both early and late gestation. The apparent digestibility of gross energy was increased for sows in late gestation （P 〈 0.05）, and lactation （quadratic effects, P 〈 0.0S）. At farrowing and weaning, serum prolactin levels and alkaline phosphate activities linearly increased in sows as the Mg supplementation increased （P 〈 0.0.5）. Serum Mg of sows at farrowing and serum urea nitrogen of sows at weaning was significantly influenced by Mg supplementation （P 〈 0.05）. The Mg concentration in sow colostrum and the serum of their piglets were increased by supplemental magnesium （P 〈 0.05）. In addition, growth hormone levels were linearly elevated （P 〈 0.05） in the serum of piglets suckling sows. Our data demonstrated that supplemental magnesium has the potential to improve the reproduction performance of sows, and the suitable supplemental dose ranged from 0.015% to 0.03%.

关键词： gilts Magnesium Piglets Reproduction Sows

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：