scholarly journals Milk protein concentration, estimated breeding value for fertility, and reproductive performance in lactating dairy cows

2017 ◽  
Vol 100 (7) ◽  
pp. 5850-5862 ◽  
Author(s):  
John M. Morton ◽  
Martin J. Auldist ◽  
Meaghan L. Douglas ◽  
Keith L. Macmillan
Keyword(s):  
Dairy Cows ◽  
Reproductive Performance ◽  
Protein Concentration ◽  
Milk Protein ◽  
Breeding Value ◽  
Lactating Dairy Cows ◽  
Estimated Breeding Value

Associations between early lactation milk protein concentrations and the intervals to calving for Holstein cows of differing parity

2017 ◽  
Vol 57 (10) ◽  
pp. 2100 ◽  
Author(s):  
Jack Fahey ◽  
John M. Morton ◽  
Martin J. Auldist ◽  
Keith L. Macmillan
Keyword(s):  
Dairy Cows ◽  
Reproductive Performance ◽  
Milk Protein ◽  
Holstein Cows ◽  
Breeding Period ◽  
Gestation Length ◽  
Calving Interval ◽  
Early Lactation ◽  
Average Interval ◽  
Lactating Dairy Cows

High milk protein concentrations (MP%) have been positively associated with the reproductive performance of lactating dairy cows. No studies have measured the effects of this association on subsequent calving dates in multiparous cows, nor assessed whether the underlying causal mechanisms are present in nulliparous heifers. Holstein cows (primiparous = 918; multiparous = 4242) were selected from herds that had seasonally concentrated calving patterns resulting from seasonally restricted breeding periods. In seasonally calving herds, the date of a herd’s planned start of calving (PSC date) is the average gestation length of 282 days after the date that the preceding breeding period commenced, so that the interval from the herd’s PSC date to each cow’s actual calving date (PSC-to-calving interval) primarily reflects the time to conception from the start of the breeding period in the previous year. This measure was used to compare associations between the average MP% during the first 120 days of lactation and time to the calving that initiated that lactation in primiparous and multiparous cows. Early lactation MP% was negatively associated with PSC-to-calving interval. A 1% difference in MP% was associated with an 8-day difference in the average PSC-to-calving interval in primiparous cows and a 31–35-day difference in the average interval in multiparous cows. The observed associations between early lactation MP% and PSC-to-calving interval are likely to involve determinants present during a cow’s breeding period that affect the probability of conception. Some of these determinants are not restricted to early lactation as the association between MP% and PSC-to-calving interval in primiparous cows is a reflection of the reproductive performance in nulliparous heifers at ~15 months of age.

scholarly journals Associations between milk protein concentration at various stages of lactation and reproductive performance in dairy cows

2016 ◽  
Vol 99 (12) ◽  
pp. 10044-10056 ◽  
Author(s):  
J.M. Morton ◽  
M.J. Auldist ◽  
M.L. Douglas ◽  
K.L. Macmillan
Keyword(s):  
Dairy Cows ◽  
Reproductive Performance ◽  
Protein Concentration ◽  
Milk Protein

The effects of energy source and level of digestible undegradable protein in concentrates on silage intake and performance of lactating dairy cows offered a range of grass silages

1999 ◽  
Vol 68 (4) ◽  
pp. 763-777 ◽  
Author(s):  
T. W. J. Keady ◽  
C. S. Mayne ◽  
D. A. Fitzpatrick ◽  
M. Marsden
Keyword(s):  
Energy Source ◽  
Dairy Cows ◽  
Milk Fat ◽  
Protein Concentration ◽  
Milk Protein ◽  
Apparent Digestibility ◽  
Concentrate Energy ◽  
Lactating Dairy Cows ◽  
And Performance ◽  
Concentrate Energy Source

AbstractThe effects of energy source and level of digestible undegraded protein (DUP) in concentrates on silage intake and performance of lactating dairy cows, offered one of a range of grass silages differing in digestibility and intake characteristics, were evaluated in a partially balanced change-over design experiment involving 48 cows. Four silages were prepared using differing management practices prior to and during ensiling. All silages were treated with an inoculant additive. For silages A, В, С and D, dry matter (DM) concentrations were 199, 320, 313 and 223 (s.e. 4.6) g/kg, pH values 3.82, 4.03, 4·03 and 5·27 (s.e. 0.056), ammonia nitrogen (N) concentrations 58, 122, 66 and 356 (s.e. 13.2) g/kg total N and in vivo DM apparent digestibilities 077, 0.75 , 0.60 and 0.60 (s.e. 0·013) respectively. When offered as the sole diet to 12 dairy cows in a partially balanced change-over design experiment, silage DM intakes were 14.7, 14.7, 12.7 and 10.5 (s.e. 0·36) kg/day respectively for silages А, В, С and D. Six concentrates containing three starch concentrations, each at two levels of DUP, were formulated to have similar concentrations of crude protein, metabolizable energy (ME) and fermentable ME. For the low and high starch concentrates and low and high levels of DUP, starch concentrations were 22·5 and 273 g/kg DM and DUP levels were 44 and 60 g/kg DM respectively. Silages were offered ad libitum supplemented with 10 kg fresh concentrate per head per day. For silages А, В, С and D, DM intakes were 10.8, 11.2, 10·7 and 9·1 (s.e. 0·26) kg/day and milk yields 29.0, 27.6, 27.1 and 25.7 (s.e. 0.69) kg/day respectively. With the exception of milk protein concentration there were no significant (P> 0.05) silage type by concentrate energy source and/or level of DUP interactions on silage intake, milk output or composition. Concentrate energy source had no effect (P> 0.05) on silage DM intake, the yields of milk, fat, protein or fat plus protein or milk fat concentration. However, increasing starch concentration increased milk protein concentration (P< 0·001), urinary allantoin concentration (P< 0·01) and diet apparent digestibility (P< 0·001). Altering concentrate DUP level had no effect (P> 0·05) on silage DM intake, yields of milk, protein, fat or fat plus protein, milk f at concentrations or diet apparent digestibility. Increasing the level of DUP decreased milk protein (P< 0·05) concentration. It is concluded that with silages of varying digestibility, fermentation and intake characteristics, there were no concentrate energy source and/or level of DUP by silage type interactions on silage intake, milk yield or composition, or diet apparent digestibility with the exception of a silage type by concentrate level of DUP interaction on milk protein concentration. With out-of-parlour feeding of concentrates the results of the present study suggest that there is no evidence to justify the formulation of concentrates differing in energy source or level of DUP to complement individual silage types.

scholarly journals Associations between milk protein concentration, milk yield, and reproductive performance in dairy cows

2016 ◽  
Vol 99 (12) ◽  
pp. 10033-10043 ◽  
Author(s):  
J.M. Morton ◽  
M.J. Auldist ◽  
M.L. Douglas ◽  
K.L. Macmillan
Keyword(s):  
Dairy Cows ◽  
Milk Yield ◽  
Reproductive Performance ◽  
Protein Concentration ◽  
Milk Protein

Comparison of Dried Molassed and Unmolassed Sugar Beet Feed and Barley as Energy Supplements on Nutrient Digestion and Supply in Silage Fed Cows

1988 ◽  
Vol 1988 ◽  
pp. 25-25
Author(s):  
D E Beever ◽  
J D Sutton ◽  
D J Thomson ◽  
D J Napper ◽  
D L Gale
Keyword(s):  
Dairy Cows ◽  
Protein Concentration ◽  
Milk Protein ◽  
Lactating Cows ◽  
Lactating Dairy Cows ◽  
Nutrient Digestion ◽  
Energy Supplements ◽  
Protein Supply ◽  
High Protein Diets ◽  
Protein Diets

In the previous paper, Sutton et al. (1985) examined the effect of concentrate type on the performance of lactating dairy cows and reported significant effects with respect to silage intake and milk protein concentration. In this experiment, conducted in parallel with that reported by Sutton et al. (1988), the effect of concentrate type on nutrient digestion in the rumen and protein supply to the tissues of lactating cows was examined, although the comparison was restricted to examination of the high protein diets only.

1265 Association between management practices and reproductive performance of lactating dairy cows

2016 ◽  
Vol 94 (suppl_5) ◽  
pp. 610-610
Author(s):  
G. M. Schuenemann ◽  
J. M. Piñeiro ◽  
P. Turiello
Keyword(s):  
Dairy Cows ◽  
Reproductive Performance ◽  
Management Practices ◽  
Lactating Dairy Cows

The effects on milk yield and composition of incorporating lactose into the diet of dairy cows given protected fat

1996 ◽  
Vol 62 (1) ◽  
pp. 1-3 ◽  
Author(s):  
P. C. Garnsworthy
Keyword(s):  
Sugar Beet ◽  
Dairy Cows ◽  
Milk Yield ◽  
Milk Fat ◽  
Protein Concentration ◽  
Milk Protein ◽  
Basal Diet ◽  
Fat Supplementation ◽  
Holstein Friesian ◽  
Group A

AbstractTwenty-eight Holstein/Friesian dairy cows were divided into four groups of seven. From weeks 4 to 15 of lactation they were given a basal diet consisting of 8 kg hay, 2 kg sugar-beet feed and 2 kg grass nuts, together with a concentrate allowance of 8 kg/day. Concentrates for group A were based on cereals and soya (control). Concentrate B contained 60 g protected fat supplement per kg; concentrate C contained 100 g lactose per kg; concentrate D contained 60 g fat supplement and 100 g lactose per kg. Milk yields were 24·6, 27·7, 25·6 and 26·5 kg/day and milk protein concentrations were 32·3, 30·7, 32·7 and 31·9 g/kg for groups A, B, C and D respectively. The effect of fat supplementation on milk yield and protein concentration was significant (P < 0·05) but the effect of lactose was not significant. Milk fat concentration was not significantly affected by treatment. It is concluded that lactose can partially alleviate the depression in milk protein concentration often observed when cows are given protected fat.

scholarly journals Addition of Clinoptilolite In The Diet Reduces Uterine PMN Leukocytes And Open Days In Multiparous Lactating Dairy Cows Managed In A Mountain Tropical Pasture-Based System

2021 ◽  
Author(s):  
Franklin I Sinchi ◽  
Jenny F. Zuin ◽  
Juan Pablo Garzón ◽  
Gonzalo E. López ◽  
Guido Calle ◽  
...  
Keyword(s):  
Dairy Cows ◽  
Reproductive Performance ◽  
General Linear Model ◽  
Tropical Pasture ◽  
Chi Square ◽  
Lactating Dairy Cows ◽  
Uterine Health ◽  
Pmn Leukocytes ◽  
Chi Square Test ◽  
Subclinical Endometritis

Abstract This study was aimed to assess the effect of adding clinoptilolite in the diet on uterine health and reproductive performance in multiparous lactating dairy cows managed in a tropical pasture-based system above 2500 meters of altitude. Seventy-seven multiparous Holstein crossbred cows were allocated randomly into two groups: clinoptilolite supplemented cows (CLG, n = 42) and non-supplemented cows as control (CG, n = 35). Cows from CLG were supplemented with clinoptilolite from 30 days (50 g/cow/day) before to 60 days after calving (200 g/cow/day). Data were analyzed by general linear model, least squares means and chi-square test of SAS. In CLG cows, percentages of uterine PMN leukocytes (P<0.0001) and proportion of subclinical endometritis (P=0.0187) were lower than in CG. The interval calving to first corpus luteum was shorter (P=0.0759) in CLG than CG, and calving to first service interval was similar between treatments. Cows from CLG became pregnant 35 days earlier than CG cows (P=0.0224). In conclusion, daily addition of clinoptilolite in the diet decreased the proportion of cows with subclinical endometritis and shortened the interval from calving to conception in lactating dairy cows.

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