scholarly journals Effect of Age at First Egg on Reproduction Performance and Characterization of the Hypothalamo–pituitary–gonadal Axis in Chickens

2021 ◽  
pp. 101325
Author(s):  
Y.G. Tan ◽  
X.L. Xu ◽  
H.Y. Cao ◽  
W. Zhou ◽  
Z.Z. Yin
Keyword(s):  
Reproduction Performance ◽  
Effect Of Age

scholarly journals ANATOMICAL AND CHEMICAL PROPERTIES OF JUVENILE Schizolobium amazonicum WOOD

2018 ◽  
Vol 42 (3) ◽  
Author(s):  
Graziela Baptista Vidaurre ◽  
Benedito Rocha Vital ◽  
Jorge Luiz Colodette ◽  
Angélica de Cássia Oliveira ◽  
João Gabriel Missia da Silva ◽  
...  
Keyword(s):  
Chemical Elements ◽  
Chemical Properties ◽  
Chemical Characterization ◽  
Tree Age ◽  
Chemical Components ◽  
Cellulose Content ◽  
Anatomical Characteristics ◽  
Effect Of Age ◽  
High Cellulose

ABSTRACT The objective of this study was to determine the effects of tree age and of pith-bark and base-top positions on anatomical characteristics, and the effect of age on the chemical components of Schizolobium amazonicum (Paricá wood). The material was obtained from commercial plantations in the states of Maranhão and Pará with ages of 5, 7, 9 and 11 years. The first three logs (2.7 m length each) were obtained from the trees of each age. Only the effect of age was analyzed for the chemical characterization of the wood. The dimensions of the fibers increased along the pith-bark direction, while wall thickness decreased and the length of the fibers increased with aging. The width of the fibers and the lume diameter increased in the base-top direction. Paricá wood presented low extractive and hemicellulose content, and high cellulose content. The anatomical characteristics were more affected by the factors under study than the chemical composition, evidencing that the chemical elements of the wood are more stable with aging in relation to the anatomical characteristics.

scholarly journals Characterization of Oviduct Lining, with Emphasis on the Sperm Storage Tubule Region (Uterovaginal Junction), Correlated with Fertility in Mature and Old Thai Native Hens

Animals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3446
Author(s):  
Theerapat Kheawkanha ◽  
Wuttigrai Boonkum ◽  
Thevin Vongpralub ◽  
Vibuntita Chankitisakul
Keyword(s):  
Morphological Characteristics ◽  
Reproductive Organs ◽  
Sperm Storage ◽  
Fertility Rate ◽  
Histological Characteristics ◽  
Native Chickens ◽  
Sperm Storage Tubules ◽  
Effect Of Age

The effect of age on fertility was investigated in Thai native chickens. The objective of this study was to determine the effects of age (mature and old) on the morphological characteristics of the reproductive organs and the histological characteristics of the uterovaginal junction (UVJ) tissues, resident sperm in the UVJ, and fertility duration in Thai native hens. We found no differences in the morphological characteristics of the reproductive organs, except for the number of follicles and the sizes of the fifth large yellow follicle in mature hens, which were greater than those in old hens (p < 0.05). The diameter of the sperm storage tubules (SSTs) epithelium was larger in old hens than in mature hens (p < 0.05), whereas the epithelium height was lower in old hens (p < 0.05). The number of sperm in the SSTs was greater in mature hens compared with old hens (p < 0.05). Mature hens showed a higher fertility rate than old hens. Our results suggest that, in old hens, the function of the SSTs is impaired, and sperm cannot be retained. Such a deterioration of the SSTs may be one of the factors involved in the decline in fertility.

Characterization of naı̈ve, memory and effector CD8+ T cells: effect of age

2004 ◽  
Vol 39 (4) ◽  
pp. 545-550 ◽  
Author(s):  
Sudhir Gupta ◽  
Ruifen Bi ◽  
Kevin Su ◽  
Leman Yel ◽  
Sujata Chiplunkar ◽  
...  
Keyword(s):  
T Cells ◽  
Cd8 T Cells ◽  
Effect Of Age

scholarly journals The study of the ovaries' state in local Bulgarian ewe's breeds by real-time ultrasonography

2008 ◽  
Vol 24 (3-4) ◽  
pp. 57-65
Author(s):  
D. Kacheva ◽  
E. Kistanova ◽  
B. Georgiev ◽  
E. Rycheva ◽  
N. Metodiev ◽  
...  
Keyword(s):  
Real Time ◽  
Transrectal Ultrasonography ◽  
Estrus Synchronization ◽  
Natural Conditions ◽  
The Moment ◽  
Effect Of Age ◽  
Real Time Ultrasonography

The aim of this study was the characterization of the ovaries' state in local Bulgarian ovine breeds at the moment of ovulation by real-time transrectal ultrasonography. It was observed 32 ewes of Bulgarian local breeds Karakachanska and West-Oldmountainous between 1,5 and 4 years old, housed under closely to their natural conditions. Ovaries were examined ultrasonically after estrus synchronization with the implantation of intravaginal sponges containing 45 mg of Cronolone over 14 days. The effect of age and breed on the variability of the ovary's size and preovulatory follicle's size was studied.

Morphological Characterization of Mycobacteriophage R1

1974 ◽  
Vol 32 ◽  
pp. 254-255
Author(s):  
B. L. Soloff ◽  
T. A. Rado
Keyword(s):  
Carbon Source ◽  
Stationary Phase ◽  
Growth Phase ◽  
Minimal Medium ◽  
Morphological Characterization ◽  
Logarithmic Growth Phase ◽  
Complete Lysis ◽  
Lysogenic Culture ◽  
Logarithmic Growth

Mycobacteriophage R1 was originally isolated from a lysogenic culture of M. butyricum. The virus was propagated on a leucine-requiring derivative of M. smegmatis, 607 leu−, isolated by nitrosoguanidine mutagenesis of typestrain ATCC 607. Growth was accomplished in a minimal medium containing glycerol and glucose as carbon source and enriched by the addition of 80 μg/ ml L-leucine. Bacteria in early logarithmic growth phase were infected with virus at a multiplicity of 5, and incubated with aeration for 8 hours. The partially lysed suspension was diluted 1:10 in growth medium and incubated for a further 8 hours. This permitted stationary phase cells to re-enter logarithmic growth and resulted in complete lysis of the culture.

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