Effect of Gonadotropin-Releasing Hormone and Calf Removal on Pituitary-Ovarian Function and Reproductive Performance in Postpartum Beef Cows2

Carter, M. L.; Dierschke, Donald J.; Rutledge, J. J.; Hauser, E. R.

doi:10.2527/jas1980.514903x

Cited by 47 publications

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“…Moreover, partial or restricted suckling reduced the postpartum anoestrous period and improved pregnancy rates elsewhere (Montoni and Riggs, 1978). This can be explained by the fact that suckling tends to suppress growth of follicles (Carter et al, 1980) and blocks ovulation (Spicer and Echternkamp, 1986). Moreover, the frequency and amplitude of LH peaks, together with reduced sensitivity of the pituitary to LH-releasing hormone may be the cause of inhibition of ovulation in suckled cows (Carruthers et al, 1980).…”

Section: Discussionmentioning

confidence: 99%

Prevalence of reproductive diseases and its associated risk factors in crossbred dairy cows

Alam

Bhuiyan

Parvin

et al. 2015

Res. Agric. Livest. Fish.

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Reproductive diseases of crossbred dairy cows significantly reduce productivity which is of great concern of dairy producers worldwide. The objectives of this study were to determine the prevalence of reproductive diseases and its associated risk factors in crossbred dairy cows in selected areas of Bangladesh. The study was conducted at eight villages of Ullapara Upazila under Sirajganj district. A total of 197 dairy farms having 488 breedable crossbred dairy cows (395 cows + 93 heifers) were randomly selected. A questionnaire as well as examination of cows was made to collect data on occurrence of reproductive diseases. The overall prevalence of reproductive diseases was 39.4%. Among the diseases, post calving anoestrus was 8.6%, delayed puberty was 6.8%, repeat breeding was 5.7%, retained placenta was 4.7%, metritis was 3.9%, dystocia was 3.3%, vaginal prolapse was 2.7%, abortion was 2.1% and uterine prolapse was 1.6%. The body condition score (BCS) of cows significantly (P<0.05) influenced the occurrence of reproductive disease. However, feeding practice, suckling, milk yield and parity did not influence significantly (P>0.05) the occurrence of reproductive diseases in crossbred dairy cows. In conclusion, further studies are needed with more number of cows to confirm the findings DOI: http://dx.doi.org/10.3329/ralf.v1i1.22357 Res. Agric., Livest. Fish.1(1): 71-79, Dec 2014

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Section: Discussionmentioning

confidence: 99%

Prevalence of reproductive diseases and its associated risk factors in crossbred dairy cows

Alam

Bhuiyan

Parvin

et al. 2015

Res. Agric. Livest. Fish.

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“…Less is known of the effect of suckling on the plasma LH levels in the cow. Carter, Dierschke, Rutledge & Hauser (1980) bled multiparous beef cows once daily for 25 days post partum and LH concentrations were lower in suckling than in non-suckling cows and there was an average of 0 and 2 ovulations per cow, respectively. GnRH-induced LH-response curves were greater for non-suckling than for suckling cows.…”

Section: Introductionmentioning

confidence: 98%

Modulation of reproductive hormones by suckling and exogenous gonadal hormones in young beef cows post partum

Chang¹,

Giménez²,

Henricks³

1981

Reproduction

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“…Higher plasma LH (Mc Natty et al, 1984) and prolactin concentrations (Munro et a/., 1980 ;Mc Natty et al, 1984) in summer than in winter could be the explanation, though it is not corroborated by some authors (Hansen and Hauser, 1984 (Clapp, 1937 ;Graves et al, 1968 ;Morrow et a/., 1969 ;Short et al, 1972 ;Randel and Walker, 1976 ;Edgerton, 1980). This interval is shortened by early weaning (Smith and Vincent, 1972 ;Laster et al, 1973 ;Bellows et al, 1974 ;Carter et al, 1980) or by a temporary suspension (48 to 72 hr) of suckling (Smith et al, 1979 ;Dunn et al, 1985).…”

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confidence: 99%

Endocrine regulation of postpartum ovarian activity in cattle : a review

Hanzen

1986

Reprod. Nutr. Dévelop.

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Summary. The Clinically, the postpartum period is characterized by a period of behavioural anoestrus, the duration of which differs in different breeds.If the detection of oestrus is optimal, anoestrus lasts for 20 to 70 days in dairy cows Callahan et al., 1971 ;Schams et al., 1978 ;Pirchner et al., 1983 ;Richardson et al., 1983 ;Etherington et al., 1984). This period is highly variable in suckled cows and lasts from 30 to 110 days (Wiltbank and Cook 1958 ;Oxenreider 1968 ;Graves et al., 1968 ;Casida et al., 1968 ; Nancarrow et al., 1977 ;Holness et al., 1978 ;Wettemann et a/., 1978 ;Short et al., 1979 ;Dunn and Kaltenbach, 1980 ;Kesler et al., 1980 ;Randel, 1981 ;Montgomery, 1982 ;Peters and Riley, 1982 . Jainudeen et al., 1982Bastidas et al., 1984 ;King and Mc Leod, 1983Leod, /1984Hansen and Hauser, 1984 ;Montgomery et al., 1985).Assay of progesterone in plasma or milk has shown that 88 % of animals of dairy breeds have an luteal activity present by 35 days after calving (Ball and Lamming, 1983) and 95 % within 50 days (Bulman and Lamming, 1978). According to different authors, the first rise of progesterone appears between 16 and 69 days after calving in dairy cows (Webb et al., 1977(Webb et al., , 1980Pirchner et al., 1983) and between 56 and 96 days in suckled cows (Fonseca et al., 1980 ;Peters and Riley 1982 ; Jainudeen et al., 1982 Jainudeen et al., /1983Montgomery et al., 1985).It is possible to detect ovarian follicles by rectal palpation in both milked and suckled cow from the second week after calving (Saiduddin et al., 1968 ;Callahan et al., 1971 ;Kesler et al., 1979 ;Webb et al., 1980 ;Kesler et al., 1980 ;Stevenson et al., 1983 (Wiltbank et al., 1962(Wiltbank et al., , 1964Dunn et al., 1969 ; Lammond, 1970 ;Corah et al., 1975 ;Whitman et a/., 1975 ;Duffour, 1975 ;Holness et al., 1978 ;Carstairs et al., 1980 ;Dunn and Kaltenbach, 1980 ; Gauthier and Thimonnier, 1982 ;Peters and Riley, 1982 ; Mc Leod, 1983/1984 ;Rutter and Randel, 1984). Some authors have found that overfeeding improves ovarian (Wiltbank et al., 1962(Wiltbank et al., , 1964Hansen et al., 1982) or pituitary (Beal et al., 1978 ;Jordan and Swanson, 1979 ;Lishman et al., 1979 ;Moss et al., 1982) function. Others have found no relation between feeding and the ovarian (Lishman et al., 1979 ;Carstairs et al., 1980) or pituitary (Hill et a/., 1970 ;Dunn et al., 1974 ;Spitzer et al., 1978 ;Haresign, 1981 ;Rutter and Randel, 1984) activity.Little is known about the mechanism under which diet exerts its effect. It is conceivable that feeding influences the ovarian response to gonadotropins (Gombe and Hansel, 1973). There was a positive correlation between the degree of fatness of an animal and the plasma concentration of 17 !3-oestradiol, 7 weeks after calving (Lishman et al., 1979).Feeding affects the release of luteinizing hormone (LHI and subsequent luteal function Spitzer et al., 1975 ;Apgar et al., 1975 ;Beal et al., 1978). It has been observed that the release of LH induced by gonadotropin releasing hormone (GnRH) injection was grea...

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Effect of Gonadotropin-Releasing Hormone and Calf Removal on Pituitary-Ovarian Function and Reproductive Performance in Postpartum Beef Cows2

Cited by 47 publications

References 0 publications

Prevalence of reproductive diseases and its associated risk factors in crossbred dairy cows

Prevalence of reproductive diseases and its associated risk factors in crossbred dairy cows

Modulation of reproductive hormones by suckling and exogenous gonadal hormones in young beef cows post partum

Endocrine regulation of postpartum ovarian activity in cattle : a review

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