Lactation curves of friesian-bunaji crosses in Nigeria

Abubakar, B.Y.; Buvanendran, V.

doi:10.1016/0301-6226(81)90027-0

Cited by 10 publications

(7 citation statements)

References 5 publications

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“…As cited by Capuco et al (2003), Bachman et al (1988) reported that the negative effect of pregnancy on milk production coincides with the onset of estrogen secretion by the fetalplacental unit, and estrogen mediates the inhibitory effects of pregnancy on lactation. Increased lactation persistency was also observed by Abubakar & Buvanendran (1981) in primiparous Frisian-Bunaji crossbred cows in Nigeria and by Cobuci et al (2001) in Guzerat cows. Farm, genetic group, season of calving, and lactation number affected the estimated total yield.…”

Section: Resultsmentioning

confidence: 82%

Environmental and genetic effects on the lactation curves of four genetic groups of crossbred Holstein-Zebu cows

et al. 2012

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-The objective of this study was to evaluate the effects of genetic group and environmental factors, including farm of origin, season of calving and lactation number, on the individual lactation curves of 1,010 Holstein-Gyr, GuzeratHolstein, Holstein-Nellore, and Holstein-Zebu F1 cows on the experimental farms of the Agricultural Research Company in Minas Gerais (Empresa de Pesquisa Agropecuária de Minas Gerais, EPAMIG). Least squares analysis and the incomplete gamma function were used to investigate differences in early milk yield, peak milk yield, time from onset to the lactation peak, persistency, total milk yield and lactation duration. The highest early yields were observed for Holstein-Gyr and Holstein-Zebu, and the lowest were observed for Holstein-Nellore cows. Early yield increased with lactation number, and the lactations that began in the late rainy and early dry seasons had the highest early yield. The time between lactation onset and the lactation peak was longer for primiparous Holstein-Gyr and Holstein-Guzerat cows. The lowest yields at the lactation peak were observed for the first lactation number. The highest values of persistency were observed for the first lactation number in Holstein-Guzerat cows. Total production from Holstein-Gyr and Holstein-Zebu cows were higher by approximately 14% and 29% compared with Holstein-Guzerat and Holstein-Nellore cows, respectively. The highest total yields were observed in lactations beginning in the dry season. Total yield increased with lactation number. The shortest lactation periods were observed in lactations beginning late in the rainy season. The incomplete gamma function was used to fit the individual curves from the genetic groups evaluated. The total yield differences were linked to early yields and yields at the peak of lactation.

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Section: Resultsmentioning

confidence: 82%

Environmental and genetic effects on the lactation curves of four genetic groups of crossbred Holstein-Zebu cows

et al. 2012

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“…In other countries, some Bos indicus breeds are also susceptible to lactation failure [14,15] and retain high volumes of residual milk [15]. Disturbance of milk ejection can be attributed to a selective inhibition of OT release from the hypophysis gland as described after weaning [8,16]; in this case, normal milk ejection can be established after OT administration [6].…”

Section: Introductionmentioning

confidence: 99%

Milk yield, residual milk, oxytocin and cortisol release during machine milking in Gir, Gir × Holstein and Holstein cows

Negrão¹,

Marnet²

2006

Reprod. Nutr. Dev.

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-This study evaluated the effect of exclusive machine milking on oxytocin (OT) and cortisol (CORT) release, and on milk yield and residual milk in Gir (group Gir), Holstein (group Hol) and crossbred animals (group GirHol). Six animals from each group were submitted to experimental milkings. As expected, milk yield was significantly higher in the Hol group than in the groups GirHol and Gir, and group GirHol produced more milk than the Gir group. In contrast, all groups exhibited significant but similar levels of OT, although OT increased more rapidly during milking for the groups Hol and GirHol than for the Gir group. In addition, CORT levels measured during and after milking were significantly influenced by the group. The Gir group showed higher levels of CORT than the groups GirHol and Hol. The lower performances of the Gir breed can not be explained by a less efficient milk ejection reflex because all cows studied released enough OT and had an effective milk ejection.zebu / crossbred / milking / oxytocin / cortisol

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“…Unspecialized cattle farmers in Brazil have used crossbred Gir (Bos indicus) H olstein (Bos taurus) cows to produce both milk and calves during the spring and summer in extensive systems [1] because these crossbred animals are well adapted to tropical conditions [39,40]. In many cases, this…”

Section: Introductionmentioning

confidence: 99%

Effect of calf suckling on oxytocin, prolactin, growth hormone and milk yield in crossbred Gir $\times$ Holstein cows during milking

Negrão

Marnet

2002

Reprod. Nutr. Dev.

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International audienceThis study evaluated the effect of different milking managements on oxytocin, prolactin and growth hormone release in Gir $\times$ Holstein cows. Six cows were suckled by their calves, before and after milking (SM group); another six cows were submitted to exclusive milking (M group). High OT levels were observed during suckling of the SM group, however both groups had similar levels of OT during milking. The SM group presented PRL levels significantly higher than the M group, however only during suckling. For GH levels, the SM group showed higher levels than the M group, however this difference was significant only during the first suckling, cleaning of the teats and at the beginning of machine milking. Despite these results, SM cows produced more milk (milking plus suckling) than M cows, however milk obtained by milking was similar for both groups

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Lactation curves of friesian-bunaji crosses in Nigeria

Cited by 10 publications

References 5 publications

Environmental and genetic effects on the lactation curves of four genetic groups of crossbred Holstein-Zebu cows

Environmental and genetic effects on the lactation curves of four genetic groups of crossbred Holstein-Zebu cows

Milk yield, residual milk, oxytocin and cortisol release during machine milking in Gir, Gir × Holstein and Holstein cows

Effect of calf suckling on oxytocin, prolactin, growth hormone and milk yield in crossbred Gir $\times$ Holstein cows during milking

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