1.
A cow's estrus cycle averages 21 days.
母牛的发情周期平均为21天。
2.
(of animals that have several estrous cycles in one breeding season) in a period of sexual inactivity.
（指在一个繁殖期有几个发情周期的动物）不动情期。
3.
Serum progesterone of mini-gilts during oestrous cycle and early pregnancy
实验小型猪发情周期和妊娠早期外周血清孕酮含量的变化规律
4.
the estrous cycle and duration of estrus in doe were in a small range of varia-tion in the five populations;
5个品种（品系）母鹿的发情周期和发情持续时间的变异范围较小;
5.
Study on the expression of ERβ and p-ERβ on mouse ovary during the oestrous cycle
ERβ及p-ERβ在小鼠发情周期卵巢内的表达
6.
Alternations of Milk Progesterone Contents in Wilnd Yak During Oestrous Cycle and Early Pregnancy
发情周期和妊娠早期牦牛乳汁中孕酮含量的变化
7.
Prostaglandin E Receptors in Porcine Uterus during Estrous Cycle and Early Pregnancy;
前列腺素E受体基因在猪发情周期和早期妊娠子宫中的表达
8.
A Study on ERβ/p-ERβ Expression and Distribution in Mouse Ovaries during Oestrous Cycle and Early Gestational Period
ERβ/p-ERβ在小鼠发情周期和早期妊娠卵巢中表达与分布的研究
9.
Study on the Follicular Wave of Dazu Black Goat and Concentrations Changes of FSH and INH during the Follicular Development
大足黑山羊卵泡发育规律及发情周期中FSH、INH水平的变化
10.
Effects of Copper lysine on Serum Reproductive Hormone Level during Estrous Cycle in Simmental Heifers
赖氨酸铜对西门塔尔牛发情周期生殖激素分泌的影响
11.
Studies on Changes of Serum Concentrations of Reproductive Hormones During the Estrous Cycle in Cattle and Buffaloes in Guangxi;
广西黄牛和水牛发情周期血清生殖激素变化规律的研究
12.
The Studies on Histological Characteristics of Follicular Systems and Corpus Luteum in Yaks During the Estrous Cycle;
发情周期牦牛卵巢中卵泡系统和黄体形态的研究
13.
Study on the Mast Cells in the Uterus and Oviduct of Goat during Estrus Cycle;
山羊发情周期不同阶段子宫与输卵管内肥大细胞消涨规律的研究
14.
Localization of LHR and the Regularity Expression of LHR mRNA in the Ovaries of Estrous Cycle Phases in Fecundity Goat
高繁山羊发情周期中卵巢内LHR的定位及其mRNA表达规律研究
15.
The Changes of the Ovarian、Estradiol and Progesterone Concentration of the Young Cows in the Estrous Cycle
发情周期中青年母牛卵巢、雌二醇和孕酮的变化规律
16.
Effects of copper-enriched yeast on reproductive hormone level during estrous cycle in Simmental heifers
富铜酵母对西门塔尔牛发情周期生殖激素分泌的影响
17.
Different Expression of LHR mRNA in the Uterus of Four Estrous Cycle Phases in Jining Gray Goat
LHR基因在济宁青山羊发情周期不同阶段子宫中表达差异的研究
18.
The Variation of Mast Cells and Histamine Concentration in Uterus and Oviduct of Goat in Estrous Cycle
发情周期中山羊子宫和输卵管内肥大细胞及组织胺含量的变化