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Relationships between milk insulin-like growth factor-I (IGF-I) concentration and body condition score with reproductiveperformance and milk yield in Jersey cows   
Yazarlar
 Ertuğrul KUL Ertuğrul KUL
Kırşehir Ahi Evran Üniversitesi, Türkiye
Hüseyin Erdem
Ondokuz Mayıs Üniversitesi, Türkiye
Özet
Introduction: One of the most important hormones affecting reproductive and milk yield is insulin-like growth factor I (IGF-I). IGF-I is closely related to nutritional status and the post-partum ovarian activity in dairy cows. It also stimulates milk synthesis and its secretion. Body condition score (BCS) is a useful management tool routinely used to predict body fat storage and energy status in dairy cows and has a strong influence on milk production and reproductive efficiency for the upcoming lactation after calving. Many publications have been available on BCS and serum or plasma IGF-I in Holstein cows. However, the information regarding the milk of Jersey cows has been limited. Therefore, further studies have been required to reveal the effect of IGF-I and BCS on reproduction and milk yield traits of this breed. Aim: This study was conducted to investigate the relationships between milk IGF-I concentration and body condition score (BCS) with reproduction performance and milk yield of Jersey cows raised at Karakoy State Farm in Samsun. Materials and methods: The mean milk IGF-I concentration and BCS were calculated by taking the mean of the three lactation periods (70±14, 140±14, and 210±14 days) using the repeated measures analysis procedure. The enzyme-linked immunosorbent assay (ELISA) method was applied for milk IGF-I analyses. BCS was assessed using a scale of 1 to 5 points with 0.25 unit increments. Results and discussion: The effects of stage of lactation on IGF-I and BCS classes were significant (P<0.001). The effects of mean IGF-I concentration on interval calving to first service (ICFS) (0.041), calving interval (CI) (0.042), and dry period (DP) (0.030) were found statistically important. Significant correlations were also determined between mean IGF-I and ICFS (-0.184), CI (-0.183), or lactation length (LL) (-0.155), and ICFS, CI, and LL were found to be shorter in cows with higher IGF-I. Both reproduction and milk yield traits were not affected by BCS. Conclusions: The results of the study revealed that milk IGF-I concentration may be used as an indicator to detect reproduction characteristics of dairy cows.
Anahtar Kelimeler
Body condition score | Insulin-like growth factor-I | Jersey cow | Milk production | Reproduction
Makale Türü Özgün Makale
Makale Alt Türü SSCI, AHCI, SCI, SCI-Exp dergilerinde yayımlanan tam makale
Dergi Adı Large Animal Review
Dergi ISSN 1124-4593
Dergi Tarandığı Indeksler SCI-Expanded
Makale Dili İngilizce
Basım Tarihi 04-2018
Cilt No 24
Sayı 2
Sayfalar 65 / 70
BM Sürdürülebilir Kalkınma Amaçları
Atıf Sayıları
SCOPUS 3

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