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Influence of somatic cell count, body condition and lameness on follicular growth and ovulation in dairy cows.

Morris MJ, Walker SL, Jones DN, Routly JE, Smith RF, Dobson H - Theriogenology (2008)

Bottom Line: Seventy four animals 30-80 days post-partum were monitored for all three conditions before synchronization of ovarian follicular phases by administration of gonadotrophin releasing hormone (GnRH) followed seven days later with prostaglandin F2alpha (PG).Mean follicular growth and maximum follicular diameter were unaffected by any of the three conditions.However, dominant follicle growth and maximum diameter were greater in the 60 animals that ovulated compared to the 14 that did not; 1.83+/-0.16 versus 0.96+/-0.26mm/day (P=0.014) and 19.4+/-0.4 versus 16.4+/-1.2mm (P=0.003), respectively.

View Article: PubMed Central - PubMed

Affiliation: Department of Veterinary Clinical Science, Faculty of Veterinary Science, University of Liverpool, Leahurst, Neston, Wirral CH64 7TE, UK.

ABSTRACT
The objective of this study was to investigate the effect of somatic cell count (SCC), body condition score (BCS) or lameness score on ovarian follicular growth and ovulation in dairy cows. Seventy four animals 30-80 days post-partum were monitored for all three conditions before synchronization of ovarian follicular phases by administration of gonadotrophin releasing hormone (GnRH) followed seven days later with prostaglandin F2alpha (PG). Ultrasonography of both ovaries twice daily throughout the follicular phase revealed that fewer animals with combined high SCC and lameness (4/9) ovulated compared to healthy animals (19/21; P=0.006) or animals with only high SCC (11/11; P=0.004) or only lameness (21/27; P=0.06). Overall, regardless of the presence of other concurrent conditions, fewer lame cows ovulated than Non Lame animals (30/42 and 30/32; P=0.015). Mean follicular growth and maximum follicular diameter were unaffected by any of the three conditions. However, dominant follicle growth and maximum diameter were greater in the 60 animals that ovulated compared to the 14 that did not; 1.83+/-0.16 versus 0.96+/-0.26mm/day (P=0.014) and 19.4+/-0.4 versus 16.4+/-1.2mm (P=0.003), respectively. In conclusion, lameness reduced the proportion of cows that ovulated and the synergistic effect of high SCC and lameness reduced that proportion further. However, follicular growth and maximum follicular diameter were unaffected by high SCC, low BCS or lameness.

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Related in: MedlinePlus

Numbers of animals (bold type) that were healthy or had high SCC, low BCS, lameness or a combination of conditions. Also shown are numbers and percentages within each subgroup that ovulated (Ov).
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fig1: Numbers of animals (bold type) that were healthy or had high SCC, low BCS, lameness or a combination of conditions. Also shown are numbers and percentages within each subgroup that ovulated (Ov).

Mentions: Fifteen cows had more than one concurrent condition (mastitis, low body condition and/or lameness); the group distributions are shown in Fig. 1. At the time of PG injection, each cow regardless of group had a follicle of at least 10 mm diameter that grew to a maximum of 14–33 mm. The mean follicular growth rate, maximum follicular diameter and time to ovulation were similar in all groups (P > 0.1, GLM ANOVA; Table 1).


Influence of somatic cell count, body condition and lameness on follicular growth and ovulation in dairy cows.

Morris MJ, Walker SL, Jones DN, Routly JE, Smith RF, Dobson H - Theriogenology (2008)

Numbers of animals (bold type) that were healthy or had high SCC, low BCS, lameness or a combination of conditions. Also shown are numbers and percentages within each subgroup that ovulated (Ov).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2651481&req=5

fig1: Numbers of animals (bold type) that were healthy or had high SCC, low BCS, lameness or a combination of conditions. Also shown are numbers and percentages within each subgroup that ovulated (Ov).
Mentions: Fifteen cows had more than one concurrent condition (mastitis, low body condition and/or lameness); the group distributions are shown in Fig. 1. At the time of PG injection, each cow regardless of group had a follicle of at least 10 mm diameter that grew to a maximum of 14–33 mm. The mean follicular growth rate, maximum follicular diameter and time to ovulation were similar in all groups (P > 0.1, GLM ANOVA; Table 1).

Bottom Line: Seventy four animals 30-80 days post-partum were monitored for all three conditions before synchronization of ovarian follicular phases by administration of gonadotrophin releasing hormone (GnRH) followed seven days later with prostaglandin F2alpha (PG).Mean follicular growth and maximum follicular diameter were unaffected by any of the three conditions.However, dominant follicle growth and maximum diameter were greater in the 60 animals that ovulated compared to the 14 that did not; 1.83+/-0.16 versus 0.96+/-0.26mm/day (P=0.014) and 19.4+/-0.4 versus 16.4+/-1.2mm (P=0.003), respectively.

View Article: PubMed Central - PubMed

Affiliation: Department of Veterinary Clinical Science, Faculty of Veterinary Science, University of Liverpool, Leahurst, Neston, Wirral CH64 7TE, UK.

ABSTRACT
The objective of this study was to investigate the effect of somatic cell count (SCC), body condition score (BCS) or lameness score on ovarian follicular growth and ovulation in dairy cows. Seventy four animals 30-80 days post-partum were monitored for all three conditions before synchronization of ovarian follicular phases by administration of gonadotrophin releasing hormone (GnRH) followed seven days later with prostaglandin F2alpha (PG). Ultrasonography of both ovaries twice daily throughout the follicular phase revealed that fewer animals with combined high SCC and lameness (4/9) ovulated compared to healthy animals (19/21; P=0.006) or animals with only high SCC (11/11; P=0.004) or only lameness (21/27; P=0.06). Overall, regardless of the presence of other concurrent conditions, fewer lame cows ovulated than Non Lame animals (30/42 and 30/32; P=0.015). Mean follicular growth and maximum follicular diameter were unaffected by any of the three conditions. However, dominant follicle growth and maximum diameter were greater in the 60 animals that ovulated compared to the 14 that did not; 1.83+/-0.16 versus 0.96+/-0.26mm/day (P=0.014) and 19.4+/-0.4 versus 16.4+/-1.2mm (P=0.003), respectively. In conclusion, lameness reduced the proportion of cows that ovulated and the synergistic effect of high SCC and lameness reduced that proportion further. However, follicular growth and maximum follicular diameter were unaffected by high SCC, low BCS or lameness.

Show MeSH
Related in: MedlinePlus