|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Current strategies for reproductive management of gilts and sows in North America显示文摘Many advances in genetic selection, nutrition, housing and disease control have been incorporated into modern pork production since the 1950 s 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 Gn RH 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. PGF2αeffectively induces farrowing when administered within two d of normal gestation length. Ovulation synchronization, single fixed-time AI and induced parturition may lead to farrowing synchronization, which facilitates supervision and reduces stillbirths and piglet mortality. Attendance and assistance at farrowing is important especially to ensure adequate colostrum consumption by piglets immediately after birth. New performance terminologies are presented. | Robert R Kraeling Stephen K Webel | 2015 | Journal of Animal Science and Biotechnology2015，6，2： | 27 |
| 2 | Opioid modulation of FSH,growth hormone and prolactin secretion in the prepubertal gilt显示文摘 | Barb C R Kraeling R R Rampacek G B | 1992 | Endocrinology1992，133，： | 1 |
| 3 | Ovarian response of the hypophysectomized pig to pregnant mare' s serum gonadotropin 显示文摘 | Kraeling RR Davis B J Gerrits RJ | 1974 | Biol Reprod1974，10，1： | 1 |
| 4 | Effects of prolactin on conceptus survival and uterine secretory activity in pigs显示文摘 | Young KH Kraeling RR Bazer FW | | 0，，02： | 1 |
| 5 | Biological activities of glycosylated and nonglycosylated porcine prolactin显示文摘 | Young KH Buhi WC Horseman N Davis J Kraeling R Linzer D Bazer FW | | 0，，02： | 1 |
| 6 | Effect of pregnancy and exogenous ovarian steroids on endometrial prolactin receptor ontogeny and uterine secretory response in pigs显示文摘 | Young KH Kraeling RR Bazer FW | | 0，，04： | 1 |
| 7 | Nutritional regulators of the hypothalamic-pituitary axis in pigs显示文摘 | BARB C R KRAELING R R RAMPACEK G B | 2001 | Reprod2001，，58： | 1 |
| 8 | The effects of an alpha hy-droxy acid(Glycolic Acid)on hairless guinea pig skin permeability显示文摘 | Hood HL Kraeling ME Robl MG | 1999 | Food and Chemical Toxicology1999，37，11： | 1 |
| 9 | Development of a colonic release capsule dosage form and absorp tion of insulin显示文摘 | Kraeling ME Ristschel WA | 1992 | Methods Find Exp Clin Pharmacol1992，14，3： | 1 |
| 10 | Metabolic regulation of the neuroeudocrine axis in pigs 显示文摘 | Barb C R Kraeling R R Rampacek G B | 2002 | Soc for Reprod Fertil2002，59，： | 1 |
| 11 | Endocrine changes in sows exposed to elevated ambi- ent temperature during lactation 显示文摘 | BARB C R ESTIENNE M J KRAELING R R | 1991 | Domest Anita Endocrino11991，8，1： | 1 |
| 12 | Luteinizing hormone response to controlled-release deslorelin in estradiol benzoate primed ovariectomized gilts显示文摘 | Kraeling RR Barb CR Rampacek GB | 2000 | Theriogenology2000，53，9： | 1 |
| 13 | Growth hormone releasing factor decreases long form leptin receptor expression in porcine anterior pituitary cells 显示文摘 | Lin J Barb CR Kraeling RR | 2003 | Domest Anim Endocrino2003，24，2： | 1 |
| 14 | Development of a colonic releasecapsule dosage form and the absorption of insulin显示文摘 | Kraeling M E Ritschel W A | 1992 | MethodsFind Exp Clin Pharmacol1992，14，3： | 1 |
| 15 | Involvement of the central noradrenergic system in opioid modulation of luteinizing hormone and prolactin secretion in the pig显示文摘 | W J Chang CR Barb RR Kraeling | 1993 | Biol Reprod1993，49，： | 1 |
| 16 | Morphological differences among luteinizing hormone releasing hormone neurons from postpartum and estrous cycling cows显示文摘 | Leshin L S Rund L A Kraeling R R Crim J W Kiser T E | 1992 | Neuroendocrinology1992，55，4： | 1 |
| 17 | Central nervous system peptide and amino acid modulation of luteinizing hormone and prolactin secretion in the pig 显示文摘 | Kraeling R R Barb C R Leshin L S | 1992 | J Physiol Pharmacol1992，43，4： | 1 |
| 18 | Growth hormone releasing factor decreases long form Leptin receptor expression in porcine anterior pituitary cells 显示文摘 | Lin J Barb C R Kraeling R R | 2003 | Domest Anim Endocrinol2003，24，2： | 1 |
| 19 | Serum luteinizing hormone and estrogen profiles before puberty in the gilt显示文摘 | Lutz J B Rampacek G B Kraeling R R | 1984 | J Anim Sci1984，58，3： | 1 |
| 20 | Distribution of beta-endorphin immunoreactivity in the arcuate nucleus and median eminence of postpartum anestrus and luteal phase cows显示文摘 | Leshin L S Rund L A Kraeling R R Crim J W Kiser T E | 1992 | Neuroendocrinology1992，56，3： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员