Effects of Various Factors on Reproductive Efficiency

Matsoukas, J; Fairchild, T.P.

doi:10.3168/jds.s0022-0302(75)84604-2

Cited by 37 publications

(12 citation statements)

References 9 publications

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“…Spring calving cows showed double risk (OR=2.68) more than those calved during summer (OR=1.18). This was consistent with findings of Opsomer et al (2000) and Gallo et al (2002), although other researchers reported no effect of calving season (Matsoukas and Fairchild, 1975). Moreover, the relative risk of lameness increased with the increase of average DMY, which was 1.65 fold of the high yield (Fleischer et al, 2001).…”

Section: Relative Risk Of Disease Occurrencesupporting

confidence: 88%

Body Condition Scores at Calving and Their Association with Dairy Cow Performance and Health in Semiarid Environment Under Two Cooling Systems

Mandour

Al-Shami

Al-Eknah

2015

Italian Journal of Animal Science

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Under tropical environments cow's body condition at calving may influence productivity and health performance. Therefore, the current research evaluated the impact of body condition score (BCS) at calving on milk production traits and health problems of primiparous and multiparous cows raised under two cooling systems in semi-arid environment. Milk yield parameters and health disorders data at different parities were obtained from 1700 Holstein cows, which were managed under Korral Kool (KKC) and fan (FC) cooling systems in Saudi Arabia. The results revealed that KKC system induced high level of milk production improvement (305TM, days in milk, daily milk yield) (P<0.05) compared to FC, especially in multiparous cows. There was an advantage of the high BCS group under KKC system over the FC system for peak yield and period. Cows from both cooling systems having moderate BCS outdid the other groups for total milk yield. Low BCS primiparous cows reared under KKC system were the most to suffer from stillbirth (18%), and calving ease (26.1%) in winter, while high BCS were the most to be treated for mastitis (8.5% in summer). On the other hand, spring calved multiparous cows raised under FC system suffered more from lameness (21.57% -high BCS) and milk fever (4.4% -moderate BCS). Further, cows having moderate BCS kept under KKC system had the highest incidence of lameness (62.2%), and abomasum displacement (4.4%). In conclusion, achieving correct BCS at calving and cooling system is important to avoid calving subsequent lactation performance and metabolic disease losses. This work is licensed under a Creative Commons Attribution NonCommercial 3.0 License (CC BY-NC 3.0). ©Copyright M.

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Section: Relative Risk Of Disease Occurrencesupporting

confidence: 88%

Body Condition Scores at Calving and Their Association with Dairy Cow Performance and Health in Semiarid Environment Under Two Cooling Systems

Mandour

Al-Shami

Al-Eknah

2015

Italian Journal of Animal Science

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“…Findings in the literature concerning the relationship between milk yield and calving interval are at variance, as some workers found that a high level of milk production was associated with a longer open period (Morrow, Roberts, McEntee and Gray, 1966;Matsoukas and Fairchild, 1975;Spalding et al, 1975) whereas others did not (Boyd, Seath and Olds, 1954;Smith and Legates, 1962;Everett, Armstrong and Boyd, 1966). It seems that in some cases the reproductive performance of high-yielding cows may be reduced, but as Broster (1974) re-emphasized, the milk yield of a cow depends upon her nutrition and her genetic potential.…”

Section: Discussionmentioning

confidence: 99%

Abnormal patterns of ovarian activity in dairy cows and their relationships with reproductive performance

Bulman

Wood²

1980

Anim. Sci.

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Progesterone profiles were obtained from 533 dairy cows during the interval from calving to the re-establishment of pregnancy by twiceweekly radioimmunoassay of milk progesterone. The importance of abnormal patterns of ovarian activity on herd fertility was determined. Animals were divided into five categories based on profile analysis: A, normal; B, delayed start to ovarian cycles; C, cessation of cycles; D, prolonged luteal activity; and E, silent oestrus. Animals in categories B to E were subdivided into treatment groups: categories B and C either (i) untreated controls, (ii) single injection 0-5 mg luteinizing hormone-releasing hormone (Hoechst) or (iii) progesterone-releasing intravaginal device (Abbott Laboratories Ltd) inserted for 14 days; categories D and E either (i) untreated controls or (ii) single injection 0-5 mg cloprostenol (Imperial Chemical Industries). The proportion of cows in each category was: A 77-5%; B 4-9%; C 5-1%; D 1-9%; and E 10-7%. The incidence of'normal' cows was 75% (first lactation), 80% (2nd to 5th lactations) and 69% (5th to 11th lactations). For normal cows (no. = 413) the interval to the start of cyclicity varied significantly with season but was not correlated with either the intervals to first insemination or to conception. In categories B to E the open period, the number of services per conception, and the days from first insemination to conception were greater than in category A, but only in category C were any differences significant. None of the treatments reduced calving-toconception intervals.

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“…Whitmore et al (1974) analyzed a research herd of Hoi steins at the University of Wisconsin and uncovered longer intervals from calving to first estrus for cows with genetics for high yield compared to those of low yield in a single herd; however, no difference between cows of high and low genetics were observed for days open, conception rate, or number of services. Matsoukas and Fairchild (1975) Kragelund et al, (1979) warned that selection for fertility would be at the expense of yield selection. Laben et al (1981) determined that high yield had a small but real depressing effect on fertility; however, herds with high yield overcame the depression by good management.…”

Section: Parameters Of Yield Variationmentioning

confidence: 99%

Genetic relationship of yield and fertility in dairy cattle

Hansen

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Effects of Various Factors on Reproductive Efficiency

Cited by 37 publications

References 9 publications

Body Condition Scores at Calving and Their Association with Dairy Cow Performance and Health in Semiarid Environment Under Two Cooling Systems

Body Condition Scores at Calving and Their Association with Dairy Cow Performance and Health in Semiarid Environment Under Two Cooling Systems

Abnormal patterns of ovarian activity in dairy cows and their relationships with reproductive performance

Genetic relationship of yield and fertility in dairy cattle

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