Somatotropin and Lactation

Peel, C. J.; Bauman, Dale E.

doi:10.3168/jds.s0022-0302(87)80030-9

Cited by 278 publications

(111 citation statements)

References 53 publications

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“…Similar results were reported in 15 commercial dairy herds given bST, with responses ranging from 11 to 29% for milk yield (Thomas et al, 1991). Peel and Bauman (1987) reported that milk yield slowly increases the first few days after bST treatment, with maximum yield at about the sixth day after administration. Jordan et al (1991) reported that milk and protein yields increased by 18.8 and 3.3%, respectively, for high-producing cows, with no effect on somatic cell score (SCS).…”

Section: Introductionsupporting

confidence: 72%

Genetic Parameters for Yield Traits of Cows Treated or Not Treated with Bovine Somatotropin

Alseaf¹,

Keown²,

Vleck³

2007

Journal of Dairy Science

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The objective of this study was to estimate genetic correlations between yield traits of cows treated with bovine somatotropin (bST) and the same yield traits of untreated cows. Lactation records from registered Holstein cows were divided by parity into 3 data sets: 1, 2, and 3 through 5. Approximately 10% of the records in each data set were from cows treated with bST. The numbers of records of treated and untreated cows in the data sets were 4,337 and 48,765; 3,730 and 37,796; and 3,645 and 33,957. Two-trait animal models (records for cows treated or not treated) were used to estimate genetic parameters for milk production traits and somatic cell score (SCS). Estimates of heritability for milk yield for records of treated and untreated cows for the 3 data sets were 0.13, 0.16, and 0.09, and 0.18, 0.18, and 0.14, respectively, with estimates of repeatability of 0.50 and 0.41 for data set 3. Estimates of heritability for fat yield for records of treated and untreated cows were 0.31, 0.16, and 0.12, and 0.27, 0.21, and 0.16. Estimates of repeatability were 0.50 and 0.43 for data set 3. Heritability estimates for protein yield for records of treated and untreated cows were 0. 13, 0.17, and 0.12, and 0.20, 0.23, and 0.16, with estimates of repeatability of 0.52 and 0.47. Estimates of heritability for SCS for treated and untreated cows were 0.08, 0.15, and 0.13, and 0.11, 0.13, and 0.13 with repeatability estimates of 0.52 and 0.45. Estimates of genetic correlations between milk yields with and without bST treatment in lactations 1, 2, and 3 to 5 were all 0.99. Estimates of genetic correlations for fat and protein yields were 0.96 for all data sets. Estimates for SCS were 0.99. Estimates of genetic correlations between records of treated and untreated cows were large enough to conclude that records of treated and untreated cows could be considered to be one trait, with treatment as a fixed effect to account for differences in means.

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Section: Introductionsupporting

confidence: 72%

Genetic Parameters for Yield Traits of Cows Treated or Not Treated with Bovine Somatotropin

Alseaf¹,

Keown²,

Vleck³

2007

Journal of Dairy Science

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“…Si la nature de l'aliment est l'un des facteurs de variation de la production et de la qualité du lait, le recours à la somatotropine bovine recombinée (rbST) peut être considérée comme une des techniques d'intensification de la production laitière (Cordonnier, 1989). L'influence de la rbST sur la production laitière a été largement démontrée et a fait l'objet depuis plusieurs années de très nombreux travaux (Peel et Bauman, 1987 ;Chilliard, 1988 ;Dell'Orto et Savoini, 1991 ;Bauman, 1992 ;Burton et al, 1994) (Chilliard, 1988). L'augmentation de la production de matières protéiques a été trouvée aussi par Stelwagen et al (1993).…”

Section: Introductionunclassified

Effet de l'injection de somatotropine bovine recombinée (rbST) sur les performances de brebis laitières. Influence de la nature de l'aliment concentré

Dell’Orto¹,

Chiofalo²,

Savoini³

et al. 1996

Ann. Zootech.

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“…Furthermore, exogenous GH increases the number of follicles in lactating cows [7] and heifers [8,9]. The small follicles induced by GH appear to be fully rowth hormone (GH) regulates growth and differentiation of various cell types and controls G anabolism and metabolism of organs and tissues [1,2]. Although there is considerable evidence that the ovary is one of the sites of GH binding and action [3], its exact role in the control of reproduc-functional since the treatment of cattle with pregnant mare serum gonadotropin following GH resulted in significant increase of the number of ovulations and the number of embryos recovered [10].…”

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confidence: 99%

Recombinant Bovine Growth Hormone Stimulates Nuclear Maturation of Bovine Oocytes In Vitro and Promotes Subsequent Embryonic Development.

1998

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Abstract. The present study was undertaken to examine the effects of recombinant bovine growth hormone (rbGH) on nuclear and cytoplasmic maturation of bovine oocytes in vitro and subsequent embryonic development after in vitro fertilization. When cumulus-oocyte complexes (COCs) and cumulus-free oocytes were cultured in modified Medium 199 supplemented with 0, 0.1, 1, 10, 100 or 1000 ng/ml rbGH for 24 h, no cumulus expansion was observed in most COCs in the presence of any of the tested concentrations of rbGH. The efficacy of nuclear maturation of oocytes to metaphase II was promoted by rbGH only in COCs showing higher proportions at 10-1000 ng/ml (77-78%) than at 0-1 ng/ml (57-64%). When COCs were cultured in the presence or absence of 10 ng/ml rbGH for 0-9 h, the proportions of oocytes that reached prometaphase I and metaphase I after 6 and 9 h of culture, respectively, were higher in the presence (53% and 51%, respectively) than in the absence (34% and 30%, respectively) of rbGH. After in vitro maturation and fertilization, no differences were observed in the penetration rate (82-91%), pronuclear formation (27-45%) and polyspermy (23-29%) at 8 h post-insemination among cumulus-enclosed oocytes cultured in the presence of different concentrations (0-1000 ng/ml) of rbGH. When starting 8 h after insemination, the oocytes were cultured for 136 h in a chemically defined medium, 21-25% of oocytes developed to the morula stage or beyond without difference among different concentrations of rbGH during oocyte maturation. However, at 192 h post-insemination higher proportions of oocytes developed to the blastocyst stage when COCs were matured in the presence (13-15%) than in the absence (6%) of 10-1000 ng/ml rbGH. These results indicate that a stimulatory effect of rbGH on bovine oocyte maturation is dependent on the cumulus cells. Presence of rbGH in the media improved maturation rate and subsequent embryonic development to the blastocyst stage.

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Somatotropin and Lactation

Cited by 278 publications

References 53 publications

Genetic Parameters for Yield Traits of Cows Treated or Not Treated with Bovine Somatotropin

Genetic Parameters for Yield Traits of Cows Treated or Not Treated with Bovine Somatotropin

Effet de l'injection de somatotropine bovine recombinée (rbST) sur les performances de brebis laitières. Influence de la nature de l'aliment concentré

Recombinant Bovine Growth Hormone Stimulates Nuclear Maturation of Bovine Oocytes In Vitro and Promotes Subsequent Embryonic Development.

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