Effects of Dietary Chromium on Reproductive Performance of Ewes during Late Gestation and Growth and Development of Their Offspring

LIU Qi, XIAO Fang, CHEN Shiyu, ZHOU Yuying, ZOU Xihao, HUANG Yanling

doi:10.3969/j.issn.1006-267x.2019.02.027

2019 , Vol. 31 >Issue 2: 705 - 712

DOI: https://doi.org/10.3969/j.issn.1006-267x.2019.02.027

Molecular Nutrition

Effects of Dietary Chromium on Reproductive Performance of Ewes during Late Gestation and Growth and Development of Their Offspring

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College of Life Science and Technology, Southwest Minzu University, Chengdu 610041, China

Received date: 2018-07-26

Online published: 2019-02-18

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Abstract

The experiment was conducted to study the effects of dietary chromium on reproductive performance of ewes during late gestation and growth and development of their offspring. Forty Lezhi black ewes with the same parity (second parity) and similar body weight[(52.36±8.24) kg] at (90±4) d of gestation were randomly assigned to 4 groups with 10 replicates in each group and 1 ewe in each replicate, and the ewes were fed separately. The ewes in the 4 group were fed a basal diet supplemented with 0 (control), 0.4, 1.2 and 2.0 mg/kg DM chromium, respectively. Chromium was supplemented from chromium propionate. After the offspring goat kids were born, the number of the goat kids per replicate was adjusted to the same, and the goat kids were breast-fed to 21 days of age. The experiment period was 81 days in total. The results showed as follows:1) the dry matter intake (DMI) of ewes during late gestation and to 21 days after childbirth and the growth performance of offspring goat kids were not affected by dietary supplemented with different levels of chromium of ewes during late gestation (P>0.05). 2) Serum luteinizing hormone (LH) and estradiol (E2) contents of ewes at 120 d pregnancy were not affected by dietary supplemented with different levels of chromium of ewes during late gestation (P>0.05). Serum progesterone (P4) content of ewes at 120 d pregnancy was linearly improved by dietary supplemented with different levels of chromium of ewes during late gestation (P=0.016 2). Serum follicle stimulating hormone (FSH) content was quadratically improved as the dietary chromium supplemental level increase (P=0.050 4), and the highest value was obtained when chromium supplemental level was 0.4 mg/kg DM. 3) Kidney index (P=0.011 4) and rumen index (P=0.024 8) of 21-day-old offspring goat kids were linearly improved by dietary supplemented with different levels of chromium of ewes during late gestation. Thymus index was quadratically improved as the dietary chromium supplemental level increase (P=0.014 0), and the highest value was obtained when chromium supplemental level was 1.2 mg/kg DM. These results suggest that dietary supplemented with chromium can improve the contents of serum reproductive related hormones of ewes during late gestation to a certain extent, and increase kidney, thymus and rumen indexes of 21-day-old offspring goat kids.

Key words： chromium; late gestation ewes; offspring goat kids; feed intake; serum reproductive related hormones; organ indexes

Cite this article

LIU Qi, XIAO Fang, CHEN Shiyu, ZHOU Yuying, ZOU Xihao, HUANG Yanling . Effects of Dietary Chromium on Reproductive Performance of Ewes during Late Gestation and Growth and Development of Their Offspring[J]. Chinese Journal of Animal Nutrition, 2019 , 31(2) : 705 -712 . DOI: 10.3969/j.issn.1006-267x.2019.02.027

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