Reproduction, nutrition, developpement最新文献_第10页

[Feeding behavior and reticulo-ruminal repletion status in sheep fed ad libitum on grass hay or alfalfa hay, with continuous or limited access: effects on the physical control of intake]. [连续或有限取食草干草和苜蓿干草的羊的取食行为和网状瘤胃饱腹状态:对采食量物理控制的影响]。

Reproduction, nutrition, developpement Pub Date : 1988-01-01

R Baumont, J P Dulphy, J P Andrieu

{"title":"[Feeding behavior and reticulo-ruminal repletion status in sheep fed ad libitum on grass hay or alfalfa hay, with continuous or limited access: effects on the physical control of intake].","authors":"R Baumont, J P Dulphy, J P Andrieu","doi":"","DOIUrl":"","url":null,"abstract":"1) The effects of limiting time of access to forage (twice 1 hr 30 min vs continuous access) on feeding behavior and reticulo-ruminal fill were studied with two hays: a late cut grass hay and an early second cut lucerne hay. 2) With continuous access to forage, voluntary intake of lucerne hay was higher (1,693 g dry matter (DM) per day) than that of grass hay (974 g DM per day). Lucerne hay was eaten more rapidly and needed less mastication per g DM. With limited time of access, eating rates were increased, but voluntary intake was maintained only with the grass hay. 3) With continuous access to forage, rumen pool sizes (RPS) of fresh matter, DM, organic matter (OM), and fibre were higher after the evening main meal than after the morning main meal. RPS were always lower with lucerne hay, except after the evening meal. With limited time of access, RPS after the morning meal were higher than those reached by continuous access, but this was not true after evening meal. 4) The net removal of DM and OM, but not of fibre were increased during the main meal, and turnover rates of DM, OM and fibre were higher for lucerne hay. 5) These results confirm that the maximum degree of rumen fill is involved in the control of voluntary intake. However, rumen fill does not seem to control intake during the whole day and other factors may be involved, specially with rapidly digestible hays.","PeriodicalId":20966,"journal":{"name":"Reproduction, nutrition, developpement","volume":"28 3A","pages":"573-88"},"PeriodicalIF":0.0,"publicationDate":"1988-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"14531345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Photoperiodic and melatonin treatments for the control of seasonal reproduction in sheep and goats. 光周期和褪黑素处理对绵羊和山羊季节性繁殖的控制。

Reproduction, nutrition, developpement Pub Date : 1988-01-01 DOI: 10.1051/rnd:19880307

P Chemineau, J Pelletier, Y Guérin, G Colas, J P Ravault, G Touré, G Almeida, J Thimonier, R Ortavant

{"title":"Photoperiodic and melatonin treatments for the control of seasonal reproduction in sheep and goats.","authors":"P Chemineau, J Pelletier, Y Guérin, G Colas, J P Ravault, G Touré, G Almeida, J Thimonier, R Ortavant","doi":"10.1051/rnd:19880307","DOIUrl":"https://doi.org/10.1051/rnd:19880307","url":null,"abstract":"The control of seasonal reproductive activity in sheep and goats in open sheds, needs extra-light (E) during the photosensitive phase (equivalent to long days, LD), followed by treatment with melatonin (equivalent to short days, SD). In autumn-born Ile-de-France or Lacaune ram lambs, 2 months of E followed by decreasing daylength for 90 days, advanced onset of the first breeding season by allowing males to reach their maximum testis volume and sperm production earlier than for untreated ram lambs. Substitution of decreasing daylength with melatonin implants allowed a transient increase in testis volume. Adult Ile-de-France rams maintained under short light rhythms with 2 month-period, demonstrated, during at least 2 consecutive years, a testis volume equivalent to that observed during the normal breeding season. These light-treated rams produced, during non-breeding season, spermatozoa in the same quantity and quality as during the normal breeding season. In anovulatory out-of-season dairy goats, E treatment was demonstrated to be necessary before melatonin treatment and melatonin to be necessary after E treatment to stimulate oestrous and ovulatory activities. Stimulation of the anovulatory females by the introduction of treated males (\"male effect\"), appeared to be necessary to obtain maximum stimulation of the treated females. Two months of E, followed by melatonin treatment (daily injection or drenching or subcutaneous implants) allowed cycles with ovulation to be maintained for more than 2 months. Although effective for control of out-of-season reproductive activity, melatonin slightly decreased milk production when applied soon after kidding. So, total control of reproduction in sheep and goats by manipulation of photoperiod in open sheds and melatonin treatments appears feasible in both sexes.","PeriodicalId":20966,"journal":{"name":"Reproduction, nutrition, developpement","volume":"28 2B","pages":"409-22"},"PeriodicalIF":0.0,"publicationDate":"1988-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1051/rnd:19880307","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"14537323","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 85

Neuroendocrine mechanisms and light control of reproduction in domestic mammals. Nouzilly (France), 17-18 September 1987. Proceedings. 家养哺乳动物生殖的神经内分泌机制和光控制。Nouzilly(法国)，1987年9月17日至18日。程序。

Reproduction, nutrition, developpement Pub Date : 1988-01-01

引用次数: 0

Influence of photoperiod on differentiation of male cells in Helix aspersa. An autoradiographic study. 光周期对双螺旋雄性细胞分化的影响。放射自显影研究。

Reproduction, nutrition, developpement Pub Date : 1988-01-01 DOI: 10.1051/rnd:19880407

A Medina, B Griffond, P Gomot

{"title":"Influence of photoperiod on differentiation of male cells in Helix aspersa. An autoradiographic study.","authors":"A Medina, B Griffond, P Gomot","doi":"10.1051/rnd:19880407","DOIUrl":"https://doi.org/10.1051/rnd:19880407","url":null,"abstract":"Hibernating snails (Helix aspersa) were activated by placing them in environmental chambers under either long-day (LD 18:6) or short-day (LD 8:16) lighting conditions. One day after activation all the snails were injected with (3H-thymidine (5 microCi/g wet weight) in order to estimate the duration of spermatogenic phases under long and short-day cycles. Our histological and autoradiographic observations show that long-day cycles have a positive influence on the development of the male cell line, which becomes apparent from the third week of exposure. While in long-day snails labeled spermatozoa were identifiable 28 days after (3H)-thymidine injection, in short-day snails neither labeled spermatozoa nor spermatids were present in the gonads of animals killed as late as 39 days post-injection. These data strongly suggest that the photoperiod, besides acting on spermatogonial proliferation (Sokolove et al., 1983; Gomot and Griffond, 1987), has an important effect on the second meiotic division. In the course of spermatogenesis in Helix aspersa, the step from secondary spermatocyte to spermatid is probably the most sensitive to environmental factors.","PeriodicalId":20966,"journal":{"name":"Reproduction, nutrition, developpement","volume":"28 3A","pages":"617-23"},"PeriodicalIF":0.0,"publicationDate":"1988-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1051/rnd:19880407","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"14532230","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

[Ingestion, digestion, absorption. French Association of Nutrition. Paris, 14-16 May 1987. Abstracts]. 摄入，消化，吸收。法国营养协会。1987年5月14日至16日，巴黎。摘要]。

Reproduction, nutrition, developpement Pub Date : 1988-01-01

引用次数: 0

Timing the breeding season of the ewe: what is the role of daylength? 确定母羊的繁殖季节:日长有什么作用?

Reproduction, nutrition, developpement Pub Date : 1988-01-01 DOI: 10.1051/rnd:19880303

J E Robinson, F J Karsch

引用次数: 41

An experimental orthopedic treatment of the rat mandible using a functional appliance alters the fibre and myosin types in masticatory muscles. 使用功能矫形器对大鼠下颌骨进行实验性矫形治疗，改变了咀嚼肌的纤维和肌球蛋白类型。

Reproduction, nutrition, developpement Pub Date : 1988-01-01 DOI: 10.1051/rnd:19880514

C Oudet, A Petrovic, P Garcia

引用次数: 16

Pharmacological manipulation of the mammalian circadian clock: implications for the control of seasonal reproductive cycles. 哺乳动物生物钟的药理学操纵:对季节性生殖周期控制的影响。

Reproduction, nutrition, developpement Pub Date : 1988-01-01 DOI: 10.1051/rnd:19880314

F W Turek

引用次数: 4

Differential regulation of muscle and liver insulin receptors by energy restriction in growing rats. 能量限制对生长大鼠肌肉和肝脏胰岛素受体的差异调节。

Reproduction, nutrition, developpement Pub Date : 1988-01-01 DOI: 10.1051/rnd:19880517

M Balage, M Manin, M Arnal, J Grizard

引用次数: 7

Sex-linked peptidase-1 patterns in Pleurodeles waltlii Michah (Urodele Amphibian): genetic evidence for a new codominant allele on the W sex chromosome and identification of ZZ, ZW and WW sexual genotypes. waltlii Michah的性连锁肽酶-1模式:W性染色体新共显性等位基因的遗传证据及ZZ、ZW和WW性基因型的鉴定

Reproduction, nutrition, developpement Pub Date : 1988-01-01 DOI: 10.1051/rnd:19880610

C Dournon, A Collenot, M Lauthier

引用次数: 26