Milk production from subtropical non-dairy sheep. 2. Method of measuring

Aboul-Naga, Adel; El-Shobokshy, A. S.; Moustafa, M. A.

doi:10.1017/s0021859600040715

Cited by 11 publications

(5 citation statements)

References 6 publications

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“…It would therefore imply that ewes with shorter lactation length might also suffer from a low level of production so that the net effect on yield would be a reduction due to the combination of these factors. The peak yield observed within the 2nd and 3rd week of lactation herein compared with the findings of many authors (Peart et al, 1975;Aboul-Nagal et al, 1981;Ehoche et al, 1990). Aboul-Nagal et al (1981) noticed that while the milk of barki ewes declined steadily after peaking at the 2nd week, the peak lactation of Rahamani and Ossimi ewes extended until the 3rd week of lactation.…”

Section: Discussionsupporting

confidence: 70%

“…The peak yield observed within the 2nd and 3rd week of lactation herein compared with the findings of many authors (Peart et al, 1975;Aboul-Nagal et al, 1981;Ehoche et al, 1990). Aboul-Nagal et al (1981) noticed that while the milk of barki ewes declined steadily after peaking at the 2nd week, the peak lactation of Rahamani and Ossimi ewes extended until the 3rd week of lactation. Ehoche and Buvanendran (1983) also observed the same pattern of lactation in Red Sokoto does, however there appeared to be a sharp drop after the second week for the goats.…”

Section: Discussionsupporting

confidence: 70%

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Lactation and Function of Curve Parameters in Yankasa Sheep

Afolayan¹,

Abubakar²,

Osinowo³

et al. 2002

Asian Australas. J. Anim. Sci

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The accuracy of the gamma function to describe lactation curve of Yankasa ewes was investigated using milk production data obtained from 168 ewes with either complete or incomplete 84 day lactation records. Ewes were daily hand milked after over-night separation from lamb and thorough disinfection of the udder. The daily milk yield on the average was estimated from the weekly total yield. The effect of type of birth, parity, season of birth and lactation length on the components of lactation curve (a, b, c and s) were analysed by least-square procedures. All factors except parity significantly (p<0.01) influenced the curve parameters. The goodness of fit of the function did not differ between the two classes of varying duration of lactation; incomplete lactation however, showed a lower persistency and as expected lower level of production. Correlations (r p ) between lamb weight gain and milk yield using the weight records from lamb weighed at weekly intervals indicated a high and positive relationship in the early lactation that decreased in intensity as the lactation advanced.

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Section: Discussionsupporting

confidence: 70%

Section: Discussionsupporting

confidence: 70%

Lactation and Function of Curve Parameters in Yankasa Sheep

Afolayan¹,

Abubakar²,

Osinowo³

et al. 2002

Asian Australas. J. Anim. Sci

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“…Early lactation is a period of maximum dependency of the lambs on their dams for nutrients. Since it has been reported that considerable amounts of residual milk are left in dams after suckling (Aboul-Naga et al 1981), it can be deduced that milk yield during the first half of lactation was not limiting to lamb growth.…”

Section: Discussionmentioning

confidence: 99%

Effects of postpartumTrypanosoma vivaxinfection on feed intake, livevveight changes, milk yield and composition in West African Dwarf ewes and associated lamb growth rates

Akinbamijo¹,

Reynolds²,

Sherington³

et al. 1994

J. Agric. Sci.

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S U M M A R YThe effects of trypanosomiasis on digestible organic matter intake, milk yield and composition, dam liveweight changes during lactation and lamb growth rates were investigated at Ibadan, Nigeria 1991/92, using 20 West African Dwarf sheep nursing single lambs. Although digestibility coefficients were neither affected by infection nor by level of feed intake, organic matter intake during early and late lactation was significantly lower in infected dams. Nitrogen retained in late lactation was lower in infected animals due to reduced feed intake. Mean daily milk yields were not affected by the infection during early lactation; however, during the second half of lactation, average daily milk yields were significantly lower in infected animals than in uninfected controls. Variations in milk component concentrations between experimental groups did not attain statistical significance throughout lactation. While control ewes on a high plane of nutrition (CH) gained 121 g/day, infected ewes (IH) and uninfected control ewes on a medium plane of nutrition (CM) lost 45 and 5-4 g/day respectively during lactation. Liveweight gain in the lambs was not affected by infection in the dams.This study demonstrated reduction in feed intake, late lactation milk yield and dam liveweight gain with no adverse effect on digestibility coefficients, milk composition, early lactation milk yield and lamb weight gain during T. vivax infection of lactating ewes.

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“…According to Belkheir et al (2021) [19], the maximum production value was achieved during the fourth week of lactation in Tazegzawt ewes in Algeria. The variations concerning the maximum production and the week of onset are mainly related to the effects of the genotype of the breed exploited and the experimental conditions in each study (Aboul-Naga et al 1981 [23]). The persistence coefficient in D'man ewes in this study was 0.94.…”

Section: Lactation Curvementioning

confidence: 99%

Factors Influencing Milk Yield During Lactation of D’man Ewes in its Cradle in Algeria

Boubekeur,

Benyoucef,

Maaraf

et al. 2024

Annals of "Valahia" University of Târgovişte. Agriculture

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A study was conducted at the National Institute of Agricultural Research (Adrar station) between 2017 and 2019 to assess the milk yield potential of prolific D’man ewes. A total of 210 daily milk production records from (of) 21 D’man ewes were collected during three successive lambings with the weighing method before and after feeding followed by manual milking. In addition, the effects of birth type, lambing rank, birth season and weight of ewes to the struggle (at breeding) on milk production were analyzed. The least-squares averages of daily and total milk production of D’man ewes were 0.85 ± 0.03 kg and 59.1 ± 0.96 kg, respectively, and the highest daily milk yield was observed in the second week of lactation. Ewes suckling more than two lambs had the highest milk yield. Indeed, ewes with triplets or more (+57.3%) and twins (+22.1%) have a significantly higher milk yield (P<0.01) than ewes nursing single lambs. The effect of the other factors was not significant on milk production of D’man ewes. It can be concluded that increasing the quantity of milk produced per ewe according to the number of lambs suckled will help to make the most of multiple lambings thanks to a low mortality rate and improved growth, especially during the first month of lactation.

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Milk production from subtropical non-dairy sheep. 2. Method of measuring

Cited by 11 publications

References 6 publications

Lactation and Function of Curve Parameters in Yankasa Sheep

Lactation and Function of Curve Parameters in Yankasa Sheep

Effects of postpartumTrypanosoma vivaxinfection on feed intake, livevveight changes, milk yield and composition in West African Dwarf ewes and associated lamb growth rates

Factors Influencing Milk Yield During Lactation of D’man Ewes in its Cradle in Algeria

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